题目内容

Robert is said ______ abroad, but I don’t know which country he studied in.
A．to have studiedB．to studyC．to be studyingD．to have been studying
A
study这一动作发生在主句谓语之前，所以用不定式的完成时；且but I don’t know which country he studied in.说明他已经不在国外学习了，所以选A。
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