题目内容

A moment, please．I’m checking if Mr. Smith _________ free tomorrow．
A．isB．beingC．to be D．will be
D
考查从句知识。If作“如果”讲，引导条件状语从句，从句用一般现在时；作“是否”讲，引导宾语从句，从句时态不受限制，根据具体情况来定。句意“请稍等，我正在确认史密斯先生明天是否有空。”根据tomorrow可知，用一般将来时。故选D。
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