Scientists say it may be five or six years _______ it is possible to test this m
题型：不详难度：来源：
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.| A．since | B．after | C．before | D．when |
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答案
| C |
解析
| 考查连词。Since自从，after后来，before在什么之前，才，就， when当什么时候，句意：科学家们说可能五年或六年之后才有可能在人类病人上检测这种药物。根据语境选C。 |
举一反三
Mr. Black has been teaching English in a middle school _____ he came to China. | A．for ever | B．ever since | C．since then | D．long before |
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I would advise you there by bus, because it’s too crowded.| A．never of going | B．not going | C．not to go | D．that went |
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| Perseverance is a kind of quality, and that’s ______ it takes to do anything well. |
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