单项选择题

We came across an old man lying in the road.

A. saved
B. saw
C. faced
D. encountered
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单项选择题
Nobody could figure out this problem.
A. make out
B. think of
C. solve
D. discover
单项选择题
Two thirds of the sufferers of the disease were killed.
A. patients
B. spreaders
C. fans
D. pioneers
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