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
I purposely ______ from extending these observations to any length.
A．abstain
B．sustain
C．retain
D．detain
单项选择题
A．takesB．spendsC．demandsD．asks
A．takes
B．spends
C．demands
D．asks
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