单项选择题

Because of the unexpected changes, they postponed ______us an answer.

A．giving
B．have given
C．to give
D．to have given
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单项选择题
It was a bold idea to build a power station in the deep valley, but it______ as well as we had hoped.
A．came off
B．went off
C．brought out
D．make out
单项选择题
As a salesman, he works on a (an)______basis, taking 10% of everything he sells.
A．income
B．commission
C．salary
D．pension
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