【单选题】【消耗次数：1】
She ___ the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
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相关题目
【单选题】
She ________ the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
【单选题】
She_______ the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
【单选题】
2.She the door before she goes away.
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was locking
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I am going away. or not she will go is up to her to decide.
①
if
②
which
③
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④
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She had made many ( ) into the quality of the computer before buying one.
①
inquiry
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③
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Before she left to have a holiday, she_______ hard.
①
worked
②
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③
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【单选题】
She has breakfast at seven everyday, _____?
①
has she
②
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③
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④
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【单选题】
She was so _____ in her job that she didn’t hear someone knocking at the door.
①
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随机题目
【多选题】
关于利用率，说法正确的是（ ）
①
分为网络利用率和信道利用率
②
信道利用率越大，时延也就越大
③
信道利用率不可能接近100%
④
信道利用率达到50%时，时延就是空闲时时延的2倍