单项选择题

From a ______ we buy the various things needed to run a house--tea, sugar, cheese, cleaning materials, etc.

A．dealer
B．grocer
C．seller
D．waiter
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单项选择题
Other specific properties ______ equal, iron heats up faster than aluminum.
A．be
B．being
C．is
D．are
单项选择题
After driving for thirty miles, she suddenly realized that she ______ in the wrong direction.
A．was driving
B．has been driving
C．had been driving
D．drove
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