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
His ______brain has worked away on the idea of a universal cure.
A．rich
B．quick
C．productive
D．fertile
单项选择题
A．knownB．definedC．calledD．referred to
A．known
B．defined
C．called
D．referred to
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