单项选择题

The secretary worked late into the night, ______ a long speech for the president.

A．to prepare
B．preparing
C．prepared
D．was preparing
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单项选择题
Many people favor ______ more nuclear power plants.
A．to build
B．build
C．built
D．building
单项选择题
No matter how _______, it is not necessarily worthless.
A．dry a desert may be
B．a desert may be dry
C．may a desert be dry
D．a.desert dry may be
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