【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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The new toy didn’t ( ) the child’s attention for long; a few minutes later he cried again.
①
get
②
engage
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increase
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drive
【单选题】
This technology has been ?around for a long time, but not until recent years _______ it in marketing.
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businesses employed
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did businesses employ
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③
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④
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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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随机题目
【单选题】
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①
小学阶段以分科为主，中学阶段和高中阶段以综合为主
②
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③
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④
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【单选题】
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①
重视课程内容的功能化、分科化
②
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③
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④
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