单项选择题

I could not have fulfilled the task in time if it _____ for your help.

A．was not
B．had not been
C．had been
D．has been
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单项选择题
_____ the earth to be flat, people feared that Columbus would fall off the edge of the earth.
A．Having believed
B．To believe
C．Believing
D．Believed
单项选择题
_____ we go by train or by boat makes no difference.
A．If
B．When
C．Whether
D．That
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