David’s effort was because he won the first prize in the English speech contest made h

问题补充：

David’s effort was , because he won the first prize in the English speech contest, made his classmates surprised.

A. paid off; which

B. paid back; it

C. paid for; that

D. paid up; he

答案：

(答案→)A. paid off; which

B. paid back; it

C. paid for; that

D. paid up; he

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