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
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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
单项选择题
He pointed out that a (considerable) gap (existing) between the number of hours people (are paid) for working and the number of hours (spent) in productive labor.
A．considerable
B．existing
C．are paid
D．spent
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