-Where ____the envelopes ? They are nowhere to be found.--I _____them in the top drawer of your desk . How can they be missing?A.have you put ...putB.did you put ...put答案.AWHY?

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1.Where have you put the envelopes? 你把信封放在哪了? 用现在完成时表示一个过去的动作,对现在有一定的影响. 强调不知道信封在哪? Where did you put the envelopes? 一般过去时强调这是一个过去的动作,一般要和一个表过去的时间状语连用.2.第二个空填put,是过去时.