The reason he gave for not coming to your birthday party is his mother was ill.A. what; wh

问题补充：

The reason he gave for not coming to your birthday party is his mother was ill.

A. what; which

B. why; that

C. as; which

D. which; that

答案：

A. what; which

B. why; that

C. as; which

(答案→)D. which; that

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