It was in 1990 the medicine was tested on human patients.A. sinceB. thatC. beforeD. when

发布时间：2020-08-17 02:48:49

It was in 1990      the medicine was tested on human patients.
A. since
B. that
C. before
D. when

网友回答

A. since
(答案→)B. that
C. before
D. when
解析：考查强调句型。强调句型的基本结构为It is/was被强调成分that/who其它成分；其最大的特点就是去掉it is/was…that/who…句子仍然成立。要注意强调句型能强调除谓语动词以为的所有的句子成分。本题中强调的是时间状语in 1990；句意：就是在1990年这种药物在人类的病人身上测试的。故B正确。
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