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
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
单项选择题
Nancy hasn't begun working on her Ph. D,（）working on her master's.

A．still because she is yet
B．yet as a result she is still
C．yet because she is still
D．still while she is already
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