单项选择题

It is essential that these application forms ______ back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent

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单项选择题

It is reported that thirty people were killed in a ______ on the railway yesterday.

A．collision
B．collaboration
C．congestion
D．confrontation

单项选择题

Often such arguments have the effect of ______ rather than clarifying the issues involved.

A．blocking
B．obscuring
C．tackling
D．prejudicing

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