Scientists say it may be a few years it is possible to test the new medicine on patients．( )A．becauseB．afterC．beforeD．since 题目和参考答案——青夏教育精英家教网—

题目内容

3．Scientists say it may be a few years ______ it is possible to test the new medicine on patients．（　　）

A．

because

B．

after

C．

before

D．

since

分析科学家说把这种新药物用在病人身上测试前可能还需要几年时间．

解答答案：C；
根据设空处前面的 it may be a few years 和后面的"把这种新药物用在病人身上测试"可以推测整个句子的意思是"科学家说把这种药物用在病人身上测试之前还需要几年时间"表示"在…以前"用before；故选C

点评比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．

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根据短文内容,选择正确答案。

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14．--Look！Do you know the old man is giving a speech？
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