单项选择题

It______ snow tomorrow, but they will climb the mountain.

A) must
B) may
C) can
D) could
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I______ my teacher to write a reference letter to me if I see her.
A) have asked
B) ask
C) will ask
D) asked
单项选择题
People will find this valley a beautiful place______ they may spend their weekends.
A) when
B) where
C) that
D) which
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