单选题
The company admitted that it had been entirely at fault and announced that all professional fees that it had collected were to be fully ______ .
A、
refunds
B、
refunding
C、
refunded
D、
is refunded
【正确答案】
C
【答案解析】
本题需选择动词的适当词形。横线前为were to be fully，为被动语态结构，故选择(C)refunded(退还)。
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