单项选择题

The book is a（）for students of science.

A．necessary
B．must
C．important
D．useful

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单项选择题
The school is more beautiful now than（）in the past.

A．it is
B．that was
C．it was
D．this is
单项选择题
You are not a new member, are you （）. I joined only yesterday.

A．No, I'm not
B．Yes, I'm not
C．No, I am
D．Yes, I am
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