单项选择题

Please_________from smoking until the aeroplane is airborne.

A．refrain
B．prevent
C．resist
D．restrain
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单项选择题
Although many people view conflict as bad, conflict is sometimes useful ______ it forces people to test the relative merits of their attitudes and behaviors.
A．by which
B．to which
C．in that
D．so that
单项选择题
A．lackedB．requiredC．facedD．confronted
A．lacked
B．required
C．faced
D．confronted
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