单项选择题

So rapidly ______ increased that the government's housing programme needs revision.

A．has the population
B．the population has
C．the population had
D．have the population
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单项选择题
By the end of next year, we will ______.
A．accomplish the task
B．have accomplished the task
C．be accomplishing the task
D．have the task accomplished
单项选择题
The witness claimed ______ a man in the party, but he was not sure whether this was the man.
A．to see
B．to have seen
C．that he saw
D．that he has seen
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