单项选择题

One of the students hasn't prepared ______ lessons very well.

A．his
B．one's
C．ones
D．their
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The rolling mountains look grey ______ the blue sky.
A．through
B．among
C．against
D．to
单项选择题
Do you think it is going to rain over the weekend ______ .
A．I don't believe
B．I don't believe it
C．I believe not so
D．I don't believe so
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