单项选择题

When you are in your room, leave the door ______ so that your visitors do not have to knock.

A．open
B．opened
C．opening
D．being open
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单项选择题
Chinese farmers are mostly living a simple and ______ life as it is today.
A．miserable
B．economical
C．luxurious
D．sensible
单项选择题
The architectural differences may ______ confusion or discomfort for the foreign travelers.
A．vary
B．describe
C．cause
D．impress
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