单项选择题

They sat (together) (to make) (a room) (for) an old lady.

A．together
B．to make
C．a room
D．for
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单项选择题
You ______ her at the beginning, but now it is too late.
A．ought to refuse
B．have ought to refuse
C．ought to have refused
D．ought have refused
单项选择题
By the end of this month, we surely ______ a satisfactory solution to the problem.
A．have found
B．will be finding
C．will have found
D．are finding
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