The reason he explained was he was ill and unable to go to school.A. why; thatB. why; bec

问题补充：

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：

A. why; that

B. why; because

C. which; because

(答案→)D. which; that

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