单项选择题

Walking is one of the best ways for a person to ______ healthy.

A. maintain
B. reserve
C. preserve
D. stay
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单项选择题
It's as well not to get on the wrong ______ of him.
A. side
B. place
C. mood
D. foot
单项选择题
They ______ when it
A. hardly started, began to snow
B. had hardly started, had begun to snow
C. had hardly started, began to snow
D. hardly started, had begun to snow
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