单项选择题

The opening ceremony is a great occasion. It is essential _______for that.

A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
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My mother can’’t get_______because she has rheumatism (风湿病).
A．about
B．on
C．through
D．in
单项选择题
The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
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