单项选择题

I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.

A．while
B．since
C．after
D．as
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单项选择题
Professor Smith and Professor Brown will ______ in presenting the series of lectures on American literature.
A．alter
B．alternate
C．substitute
D．exchange
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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