单项选择题

Every one of us () that when any substance burns, it unites with oxygen.

A、know
B、knows
C、have known
D、has known
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单项选择题
I remember () valuable time daydreaming all day long.
A、to spend
B、I spending
C、spending
D、to have been spending
单项选择题
Improved health brings population growth, () people to move out of rural areas.
A、causes
B、causing
C、caused
D、cause
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