单项选择题

_____your valuable help, we couldn’t have finished the experiment ahead of time.

A．If it were not for
B．Had it not been for
C．Were it not for
D．If it has not been for
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单项选择题
Such animals as South China tigers are believed______, for we’ve had no track of them for ages.
A．becoming extinct
B．to become extinct
C．to have been extinct
D．having been extinct
单项选择题
Do you think______a good idea that he sold the vegetables at half price______let them go bad
A．it’s; as well as
B．it; rather than
C．it’s; instead of
D．it; as good as
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