【題目】He____ English for six years by the time he takes his exams.

A. had been studying B. was studying

C. will have been studying D. has been studying

【答案】C

【解析】考查時態(tài)；句意為“到他考試之前，他已經(jīng)學了六年英語”。因為“by the time he takes his exams.”是一個將來的時間，所以用將來完成時，故選C.

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