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

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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
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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