单项选择题

The modern society requires that young people solve the problems ______ their own.

A．of
B．for
C．on
D．to
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单项选择题
The teacher demanded that the homework ______ in two days.
A．to be handed in
B．must be handed in
C．shall be handed in
D．should be handed in
单项选择题
So far, five students in our class _____ the communist party in our class.
A．join
B．have joined
C．joined
D．will join
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