单项选择题

We desire that the tour guide ______ us immediately of any change in plans.

A．has informed
B．informed
C．informs
D．inform
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单项选择题
A new technique ______ , the gross output increased by 20 percent.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
单项选择题
Please take what you like, you ______ eat too much.
A．may not
B．would not
C．must not
D．can not
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