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
The residents, ______ had been damaged by the flood, were given help by the Red Cross.
A．all their homes
B．all whose homes
C．all of whose homes
D．all of their homes
单项选择题
John is_________hardworking than his sister, but he failed in the exam.
A．no less
B．no more
C．not less
D．no so
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