单项选择题

Mary ______ in the garden when it began to rain.

A．was walking
B．walked
C．walking
D．had walked
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单项选择题
______ in the air, fuels give off heat.
A．To burn
B．Burned
C．To be burned
D．Being burned
单项选择题
______ the umbrella with you in case it rains.
A．Bring
B．Get
C．Carry
D．Take
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