英语20.Robert is said _______ abroad,but I don’t know what country he studied in.20.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为什么

英语20.Robert is said _______ abroad,but I don’t know what country he studied in.20.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为什么
英语20.Robert is said _______ abroad,but I don’t know what country he studied in.
20.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
为什么

英语20.Robert is said _______ abroad,but I don’t know what country he studied in.20.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为什么
d

选a
句子大意：罗伯特据说留学过国外，但我不知道他在哪个国家留学。
因为后面一句中是studied in，用的是过去时，说明罗伯特留学这件事已经发生完毕，都是过去的事了，所以前文应该是听说他曾留学国外，to have studied。c,d项中留学这件事还在发生，不合题意,b项不够强调过去...

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选a
句子大意：罗伯特据说留学过国外，但我不知道他在哪个国家留学。
因为后面一句中是studied in，用的是过去时，说明罗伯特留学这件事已经发生完毕，都是过去的事了，所以前文应该是听说他曾留学国外，to have studied。c,d项中留学这件事还在发生，不合题意,b项不够强调过去

收起

A
首先排除B,C，最后，D没有具体时间提示说要用现在完成进行时，所以选A

A,已经在外国学习了，过去完成时
用HAVE STH。 DONE句子

20.Robert is said _______ abroad, but I don’t know what country he studied in.
a.to have studied
听说ROBERT留过学,但我不知道在哪个国家.

a