【单选题】【消耗次数：1】
Anewtechnique______,theyieldsasawholeincreasedby20percent.
①
working out
②
having worked out
③
having been worked out
④
to have been worked out
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相关题目
【单选题】
___ is often the case, we have worked out the production plan.
①
Which
②
When
③
What
④
As
【单选题】
______，the boy worked out the problem quickly．
①
As clever he is
②
Clever as he is
③
He is as clever
④
As he is clever
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This ATM has been out of service for a few days. It should ____ last week.
①
be fixed
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fix
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This ATM has been out of service for a few days. It should ____ last week.
①
be fixed
②
have fixed
③
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【单选题】
You _____ her in her office last Friday, she’s been out of town for two weeks.
①
needn’t have seen
②
must have seen
③
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④
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【单选题】
Having been asked to speak at the convention __________
①
some notes were prepared for Dr. Smith
②
Smith prepared some notes
③
The convention members were pleased to hear Dr. Smith
④
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【单选题】
We’ll go out as soon as I’ve ____ the kitchen.
①
sent for
②
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③
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worked out
【单选题】
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①
had been working; are still working
②
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③
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④
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【单选题】
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①
to blame
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to be blamed
③
to be blaming
④
to have been blaming
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-We’ve worked for a long time, what about stopping to have a rest? -_____________________.
①
A. I like it.
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③
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随机题目
【多选题】
关于用数字签名进行文件传输过程的说法中，错误的是（）
①
接收方用自己的私有密钥对密钥进行解密，得到秘密密钥的明文
②
接收方用公开密钥对文件进行解密，得到经过加密的数字摘要
③
接收方用发送方的公开密钥对数字签名进行解密，得到数字摘要的明文
④
接收方用得到的明文和哈希函数重新计算数字摘要，并与解密后的数字摘要进行对比