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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单项选择题
About ______ people were killed in the country’s townships by the week- end.
A．three
B．thirteen
C．forty-six
D．sixty-four
单项选择题
About ______ blacks have been killed in the past three years.
A．80
B．800
C．8,000
D．80,000
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