题目内容
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 |
A
略
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David’s effort was ______, because he won the first prize in the English speech contest, _____ made his classmates surprised.
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