Scientists say it may be five years ______ it is possible to test this medicine
题型：不详难度：来源：
Scientists say it may be five years ______ it is possible to test this medicine on human patients．| A．since | B．until | C．before | D．when |
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答案
| C |
解析
| 本题考查连词。句意：科学家说可能还要五六年才可能将此药试验在人身上。before引导时间状语从句, 表示 “过了……就”。 |
举一反三
We should give the disabled encouragement to live _________ as we do.| A．as a rich and full life | B．as rich and full a life | | C．so a rich and full life | D．so rich and full a life |
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______ you’ve got the chance, you might as well make full use of it.| A．Now that | B．After | C．Although | D．As soon as |
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—I’m green at everything.
—Don’t worry. ________you get older，you will get more experience. | A．As | B．Till | C．Unless | D．Since |
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Tom didn’t lose heart _________ he failed in the job interview and wasn’t admitted to the company.| A．as if | B．in case | C．even though | D．so that |
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Although he has become wealthy, Mr. Wood remains _________ he used to be ,modest and friendly .| A．which | B．where | C．what | D．that |
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