What’s wrong with him? I haven’t seen hi...

What’s wrong with him? I haven’t seen him _____ last Wednesday.

A. on B. since C. by

B 【解析】试题分析：句意：他怎么啦？自从上周三我就没有看到过他。A. on 在具体的一天； B. since自从···后加过去的时间点，或过去时态的句子；C. by在······之前。根据句意及结构，故选B。考点：考查介词的用法。

考点分析：

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