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A．be taught
B．taught
C．teach
D．be teaching

A.be
B.taught
C．teach
D．be

【参考答案】

A
正确是：A。根据句意此句应该用被动语态，故选A选项。

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华为荣耀5X手机耗电快／待机时间短是什么原因？如何解决

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