Tina _____ have known the truth, or she would have

Tina _____ have known the truth, or she would have told us.

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He tried to expand his reading because he thought

He tried to expand his reading because he thought good reading can _____ people’

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The withered plants _____ in the rain.

The withered plants _____ in the rain.

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During the summer holidays , he was made ______ tw

During the summer holidays , he was made ______ two hours a day. ( )A A. to swim

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试述什么是 “频率崩溃”现象,并说明发生的原因。

试述什么是 “频率崩溃”现象,并说明发生的原因。

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