单项选择题

The speaker,（）for her splendid speeches, was warmly received by the audience.

A．having known
B．being known
C．knowing
D．known

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单项选择题
No sooner had the words been spoken than he（）that he was foolish.

A．realizes
B．had realized
C．realized
D．has realized
单项选择题
Scientists now know that matter and energy are very closely related to（）

A．oneself
B．themselves
C．each other
D．one another
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