Scientists say it may be one year or so ________ it is possible to test the new
题型：不详难度：来源：
Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.| A．when | B．after | C．before | D．since |
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答案
| C |
解析
| 词义辨析。句意：科学家们说在有可能把这种新药用于人类前可能需要大约一年的时间。所以选C。 |
举一反三
He looks so weak and pale ________ suffering from a serious illness.| A．as if | B．as long as | C．now that | D．even if |
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There is no doubt _________ the world climate has been changing in recent years.| A．that | B．what | C．if | D．whether |
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children believe they can succeed, they will never become totally independent．| A．If | B．Though | C．Unless | D．When |
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| John’s success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today. |
—Did your father phone you shortly after the accident?
—No, it was a fortnight ________ he gave me a phone call. | A．since | B．when | C．while | D．before |
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