单项选择题

It was essential that the application forms ______ back hefore the deadline.

A．must be sent
B．would he sere
C．be sent
D．were sent
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单项选择题
I really don't know how you ______ their constant quarreling.
A．pat up
B．put away
C．put by
D．put up with
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．are finding
D．will have found
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