【題目】The reason __________ he explained was __________ he was ill and unable to go to school.

A. why; that B. why; because

C. which; because D. which; that

【答案】D

【解析】句意：他解釋的原因是，他生病了，無法去上學。which引導定語從句，在定語從句中作賓語。that引導表語從句。

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