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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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
单项选择题
I was unaware of the critical points involved, so my choice was quite ______.
A．artistic
B．artificial
C．arbitrary
D．mechanical
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