单项选择题

If the whole operation ______ 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
His remarks left me ______ about his real purpose.
A．wondered
B．wonder
C．to wonder
D．wondering
单项选择题
He came back late, ______ which time all the guests had already left.
A．after
B．by
C．at
D．during
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