单项选择题

AIDS is said（）the number-one killer of both men and women over the past few years in the region.

A．being
B．to be
C．to have been
D．having been

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单项选择题
Fool（）Jane is, she could not have done such a thing.

A．who
B．as
C．that
D．like
单项选择题
The main topic of the passage is（）

A．agricultural products.
B．irrigation methods.
C．natural resources.
D．water shortages.
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