题目内容

A was listened;was hearing
B listened;heard
C have listened;heard
D listened; heard of

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A had been; have seen
B have been; have seen
C had been; had seen
D have been; had seen

A was wrote
B writes
C has writing
D is written

A it
B its
C that
D those

请简答电信服务用语的基本原则