Question

. 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 答案是A，请详细解释其他答案为什么不对

Answer 1

据说Robert已经到国外学习了，但我不知道他在哪个国家学习。 从后半句看"我不知道他在哪个国家学习"studied 过去时态，所以前半句，据说“robert 在国外学习”表示他已经在国外学习了一段时间了，是状态的延续，所以要用完成时。A.to have studiedB. study, 时态不对C.to be studying “正在学习”也不对D.to have been “学习”这个动作没有表达出来。

Answer 2

C正在国外学习 D去过国外 意思不对，排除。B表要去，A以经去过了。。。从意思上来讲易知选A

Answer 3

B