单项选择题

Mr. Johnson preferred ______ heavier work to do.

A．to be given
B．to be giving
C．to have given
D．having given
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单项选择题
It is extremely urgent that they ______ from the mountain before dark.
A．must be rescued
B．should rescue
C．can be rescued
D．be rescued
单项选择题
He wore dark glasses to avoid ______.
A．being recognized
B．recognizing
C．to be recognized
D．having been recognized
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