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单选题

Once, however, it failed to give the correct time.

A然而,有一次,它不及格,报出准确的时间。

B然而,它有一次错了,给了正确的时间。

C然而,它曾有一次没有报出准确的时间。

正确答案:A (备注:此答案有误)

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