33.[1999全國] 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

 

答案：A
提示：

題目考察動詞不定式作的完成式——不定式中的動作發(fā)生晚于謂語動作的發(fā)生

 


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