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I’m impressed with his determination. When he had a problem to solve, he  _____ work at it until he found an answer.
A.wouldB.mightC.mustD.should
A
考查时态.句意:他的决心给了我深刻印象.当他有问题要解决时,他会致力于这个问题直到他找到答案.可知描述的是从过去某事时间点来看,将要发生的动作,故用过去将来时态,would为will过去时态,选A.
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