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
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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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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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