单项选择题

I ______ with all the windows closed, but now I'd like some fresh air.

A. am used to sleep
B. am used to sleeping
C. used to sleeping
D. used to sleep
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单项选择题
If you have trouble ______ the poems, the notes on the margins will help you.
A. to understand
B. understanding
C. for understanding
D. with understanding
单项选择题
Although ______ happened in that developed country sounds like science fiction, it could occur elsewhere in the world.
A. which
B. what
C. how
D. it
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