题目内容
Robert is said abroad,but I don't know what country he studied in.
A.to have studied B.to study
C.to be studying D.to have been studying
答案:A
提示:
提示:
不定式完成时表示已发生过的事。所提供的情况what country he studied in表明Robert过去曾在某个国家学习过,因此要选to have studied 。
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