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【题目】Betty ___________ hard since last term. That’s why her exam results are so good!

A. has worked B. will work C. worked D. was working

【答案】A

【解析】句意:自上学期以来贝蒂一直努力学习。那就是她考试成绩如此好的原因!考查动词时态。since last term自从上学期以来,表示的是一段时间;work工作,动词,是持续性的。根据句意,结合句子结构,可知本句是现在完成时态,Betty是三单人称,需用has构成完成时,故选A。

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