单项选择题

(The population) of this small town has (more than) (doubled) it in the past (few decades).

A．The population
B．more than
C．doubled
D．few decades
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单项选择题
(All of) the plants now (raised) on farms (have been) developed from plants (once grew) wild.
A．All of
B．raised
C．have been
D．once grew
单项选择题
I would (have come) to see you (had it been) possible, but I (had been) so busy (then).
A．have come
B．had it been
C．had been
D．then
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