单项选择题

（）for their help, we would not have overcome the difficulties.

A．Weren't
B．Had it not been
C．Hadn't it been
D．Had it been not

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单项选择题
（）more time, we will be able to come up with a better solution to the problem.

A．Given
B．To give
C．Giving
D．Be given
单项选择题
He has been interested in computer since his childhood, so he specialized（）computer science when he was in college.

A．on
B．at
C．for
D．in
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