单项选择题

It's impossible for a child to do so much work within a short period of time, ______

A. isn't it
B. is it
C. has it
D. hasn't it
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单项选择题
After a long discussion, they ______ an agreement.
A. came into
B. came out
C. came to
D. came across
单项选择题
Now that we ______ all the money, it's no use turning on me and saying it's all my fault.
A. had lost
B. lost
C. have lost
D. lose
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