单项选择题

If you want(), you should speak slowly and clearly to the listeners.

A．to be understood
B．to understand it
C．understanding
D．to understood

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单项选择题
There was a second knock at the door. It was the second time I () that afternoon.

A．was interrupted
B．was interrupting
C．had interrupted
D．had been interrupted
单项选择题
Although Helen is a new teacher, she knows () student in her class.

A．every of
B．every
C．all
D．all of
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