单项选择题

______ what to do, he went to the old man for help.

A．Not knowing
B．Not know
C．Not to know
D．Not known
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单项选择题
Didn't the council turn down Frank's proposal” “Yes. Now he regrets ______ it.”
A．to submit
B．to have submitted
C．having submitted
D．submitted
单项选择题
So rapidly ______ increased that the government's housing programme needs revision.
A．has the population
B．the population as
C．the population had
D．have the population
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