【单选题】【消耗次数：1】
Scientists say it may be five or ten years __________ it is possible to test this medicine on human patients.
①
since
②
before
③
after
④
when
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相关题目
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After ten years, all these youngsters became____.
①
grown-up
②
grown-ups
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growns-ups
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growns-up
【单选题】
When my own son was five years old, I became （ ）for another baby.
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eager
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desire
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There is no smoke without fire.
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like directed
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so that directed
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Doctors have said that as many as 50% of patients dont take medicine ______.
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like directed
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When he came back after an absence of 20 years, he found his hometown completely ____. ?
①
changing ?
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③
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随机题目
【单选题】
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①
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②
隔离层→粉衣层→糖衣层→色糖衣层→打光
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①
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②
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②
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