单项选择题

If the whole opera, on ______ beforehand, a great deal of time and money would have been lost.

A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
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单项选择题
Students are expected to be quiet and ______ in an Asian classroom.
A．obedient
B．overwhelming
C．skeptical
D．subsidiary
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
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