【題目】 It_______ ten years since Professor Du last_______ to the earth.

A. was； came B. has been； come

C. was, come D. is； came

【答案】D

【解析】

試題分析：句意：自從杜教授上次來地球已經(jīng)是10年的時間了。根據(jù)It is ten years since+一般過去式的一般疑問句，故選D.

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