题目内容
【题目】
My newly-purchased magazine is nowhere to be found. ______ I have left it on the train?
A. Could B. Should
C. Must D. Would
【答案】A
【解析】 句意:我新买的杂志到处都找不到。我会不会把它落在火车上了呢? could have done 表示对过去的推测。should have done “过去本应该做某事(事实上没有做)”; must have done “过去一定做了某事”; would have done 表示对过去的虚拟。
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