问题: 英语小选择`````
Bob is said ___abroad ,but I didn't know what country he studied in .
A,to have studied B,to study
C,to be studying D,to have been studying
解答:
Bob is said ___abroad ,but I didn'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
译文：有人说鲍勃曾经出国留学过，但我不知道他究竟是在哪个国家留学。
解析：表示在说话之前就已经发生的事情所以应该用上不定式的完成式表示动作在说话之前就已经发生了。
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