单项选择题

We should（）study hard during our time in the university.

A．all
B．every
C．some
D．any

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单项选择题
The book is a（）for students of science.

A．necessary
B．must
C．important
D．useful
单项选择题
Not only was she hard-working,（）

A．how beautiful she was
B．was she helpful
C．but she was also polite
D．what a beautiful girl
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