【題目】He knew ________ he should work hard.

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

【答案】C

【解析】

句意：他知道他應(yīng)該努力工作�？疾橘e語(yǔ)從句引導(dǎo)詞。if是否，表疑問；when什么時(shí)候，表時(shí)間；that無(wú)實(shí)義；where在哪里，表地點(diǎn)。本句主句和從句主語(yǔ)一致，從句結(jié)構(gòu)完整，根據(jù)句意語(yǔ)境，可知ABD都不合句意，故選C。

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