He didn’t make clear when and where the meeting would be held.A. thisB. that C. itD. thes

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A. this
B. that
(答案→)C. it
D. these
解析：考查it做形式宾语的用法：这里的it是形式宾语，when and where the meeting would be held.
是真正的宾语从句，句意：他没有明确什么时候什么地方举行会议。选C。