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
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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
单项选择题
Every means ______ tried but without much success.
A．have been
B．has been
C．will be
D．are being
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