Robert is said ________ abroad, but I don't know what country he studied in．
A.to have studiedB.to studyC.to be studyingD.to have been studying在线课程A
解析：
解题思路：本题考查不定式完成时的用法，不定式完成时表示动作发生在谓语动词之前，提示在后半句，but I don't know what country he studied in，这说明他过去在国外留过学．
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