Scientists say it may be five or ten years___________ it is possible to test thi
题型:不详难度:来源:
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.A.since | B.before | C.after | D.when |
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答案
B |
解析
本题是考查连词的用法。本题的关键是理解句子的含义:“科学家说还需要五到十年才有可能将药物在人体身上进行实验。”只有B选项符合题意。 |
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