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
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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
单项选择题
Just because I’m______to him, my boss thinks he can order me around without showing me any respect.
A．redundant
B．trivial
C．versatile
D．subordinate
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