Xinjiang is one of the areas        sandstorms happen most often,        results from a dry climate, vast desert and a strong wind.
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A
where; which
B
when; that
C
where, that
D
that; which
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There are two rooms in the apartment, ________ serves as a kitchen.
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A
the smaller of them
B
the smallest of which
C
the smaller of which
D
smallest of which
Please never do such things _______ other people. 
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A
that will do harm to
B
as they will do harm to
C
as will do harm to
D
which are harmful to