It is unfortunate that, due to a glitch in the computer system, several of our most valued customers______incorrectly.

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问题 It is unfortunate that, due to a glitch in the computer system, several of our most valued customers______incorrectly.

选项 A、bills
B、was billing
C、were billed
D、have billed

答案C

解析 bill是及物动词，表示“收取(费用)”，因横线后没有宾语，故应填入其被动语态。答案是(C)were billed。

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