单项选择题

______ she was very tired, she went to bed very late.

A．Because
B．Though
C．Now that
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单项选择题
Trees take harmful gas from the air, and ______ oxygen (氧气)into the air.
A．let out
B．set off
C．give up
单项选择题
______ wonderful music it is!
A．How
B．What
C．What a
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