【題目】—The light in his office is still on. Do you know ?

—To work on a very important project.

A. if he works hard B. why he keeps working

C. why is he so busy D. when he will stop working

【答案】B

【解析】句意：——他的辦公室的燈仍然亮著，你知道他為什么一直工作嗎？——為了完成一個非常重要的項目。根據(jù)Do you know可知，本題考查賓語從句，賓語從句中一般為陳述語序，選項C是疑問語序，所以排除掉；再根據(jù)“To work on a very important project.”可知，動詞不定式to引導的句子在這里表示原因，提問的話應該用why，故答案選B。

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