【单选题】【消耗次数：1】
4.Scientists didn’t know much about lung cancer ______.
①
before long
②
until recently
③
long before
④
in the past few years
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相关题目
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This technology has been ?around for a long time, but not until recent years _______ it in marketing.
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businesses employed
②
did businesses employ
③
businesses had employed?
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had businesses employed
【单选题】
It was quite a few years before Mark Twain finally finished his last novel.
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②
B．在马克·吐温完成最后一部小说之前，又是好几年了。
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C．过了好几年，马克·吐温才终于完成最后一部小说。
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The prices of the agricultural products have been ____ steadily in the past few years.
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risen
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【单选题】
A： How long have you been here?B： Not for long, only about five minutes. Alice and Monica ______ here with me.
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have learned
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【单选题】
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随机题目
【单选题】
以下不属于中小学自我意识辅导的内容的是（ ）。
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小学高年级学生要正确认识自己的优缺点和兴趣爱好
②
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④
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