单项选择题

My aunt arrived here ______ a warm spring morning.

A． in
B． at
C． on
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单项选择题
The window is dirty. ______ I clean it for you
A． Do
B． Will
C． Shall
单项选择题
______, the stronger the wind is.
A． The brighter the sun is
B． The harder it is raining
C． The faster the air is moving
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