单项选择题

______ for your help, we'd never have been able to get over the difficulties.

A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
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单项选择题
This is the place ______ the foreign guests are going to visit.
A．where
B．when
C．how
D．which
单项选择题
______ he had forgot to take his notebook.
A．That occurred to him
B．To him that occurred
C．He occurred that
D．It occurred to him that
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