题目内容
A lot of tests ________ on a large number of rats in the past two years.A.have been carried out
B.were carried out
C.have been carried on
D.were carried on
答案:A
提示:
提示:
| 在过去两年中,我们做的事情应该用完成时,carry on继续开展,坚持,carry out执行
|
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