中文谷Lookattheground,itiswet.It
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問題詳情：
Look at the ground, it is wet. It ________ last night.
A. must have rained B. must rain C. could have rained D. should have rained
【回答】
A
知識點：虛擬語氣與情態動詞
題型：選擇題
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