单项选择题

My mother can’’t get_______because she has rheumatism (风湿病).

A．about
B．on
C．through
D．in
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单项选择题
The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
单项选择题
A．IfB．AsC．ThoughD．Unless
A．If
B．As
C．Though
D．Unless
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