The reason he was absent from the meeting is he suffered form a headache.A. what; because

问题补充：

The reason he was absent from the meeting is he suffered form a headache.

A. what; because

B. for; that

C. why; that

D. when; because

答案：

A. what; because

B. for; that

(答案→)C. why; that

D. when; because

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