单项选择题

It is high time we ______ this practice.

A．stop
B．stopped
C．have stopped
D．had stopped
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单项选择题
We regret ______ you that the materials you ordered are out of stock.
A．informing
B．to inform
C．having informed
D．to have informed
单项选择题
I hope I ______ my graduation paper by the end of this year.
A．shall finish
B．finish
C．have finished
D．shall have finished
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