单项选择题

A suggested measure to be taken to reduce teenagers' driving accidents is ______

A．driving in the presence of an adult should be made a rule
B．they should be prohibited from taking on passengers
C．they should not be allowed to drive after l0 p.m.
D．the licensing system should be improved

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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

单项选择题

All flights ______ because of the terrible weather, they had to go there by train.

A．having been canceled
B．had been canceled
C．having canceled
D．were canceled