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
______ it will do us harm or good remains to be seen.
A．Whether
B．If
C．As
D．All
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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