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【題目】I ___________ hard to improve my skills in the past three years.

A. have workedB. workC. workedD. are working

【答案】A

【解析】

句意：在剛過去的三年里，我努力提高自己的技能。A. have worked現在完成時；B. work一般現在時；C. worked一般過去時；D. are working現在進行時。in the past/last+時間段，表示“在剛剛過去的一段時間里”，用在現在完成時態(tài)的句子中，故答案為A。

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