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
Why are some women likely to get angry when a man holds the door open for them
A．Because the man should not have held the door open.
B．Because they think they are looked down upon.
C．Because they are treated too politely.
D．Because men are too manly.
单项选择题
The snow turns to ice when______.
A．it gets wet
B．the next snowfall comes
C．the temperature gets colder
D．the snow above it is heavy enough
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