【題目】—I dropped by at 6:00pm yesterday but failed to see you at your house.

—I ______ in a gym at that time.

A. was exercising B. am exercising C. have exercised D. had exercised

【答案】A

【解析】考查過去進行時態(tài)。句意:——昨天下午六點我順便拜訪了你，但是你沒有在家�！莻�時間我正在體育館鍛煉。根據(jù)時間關(guān)鍵詞 at that time可知，用過去進行時態(tài)，故選A。

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