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【题目】He knew ________ he should work hard.

A. if B. when C. that D. where

【答案】C

【解析】

句意:他知道他应该努力工作。考查宾语从句引导词。if是否,表疑问;when什么时候,表时间;that无实义;where在哪里,表地点。本句主句和从句主语一致,从句结构完整,根据句意语境,可知ABD都不合句意,故选C。

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