Scientists say it may be five or six years ______ it is possible to test this m
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Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.A.before | B.after | C. since | D.when |
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答案
A |
解析
试题分析:考查固定句式。固定句式:It be 一段时间 before…一段时间以后某事才发生;如果before后面使用一般现在时,前面的主语使用将来时;如果before后面使用一般过去时,前面也使用一般过去时;句意:科学家说也许5,6年以后在病人身上进行这种药物的测试会变得可能。故A正确。 点评:在高中的学习中平时要多积累固定搭配的用法,考试时只能凭借记忆力来答题,尤其是单项选择很难推出某个搭配的意思,所以平时的积累记忆是尤其重要的。 |
举一反三
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