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這一動作發(fā)生在主句謂語之前，所以用不定式的完成時；且but I don’t know which country he studied in.說明他已經(jīng)不在國外學習了，所以選A。
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