单项选择题

______ the balcony, it could have saved me a lot of troubles.

A．Have I known
B．Had I known
C．I have known
D．I had known
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单项选择题
The museum contains the ______ of Chinese antiquity.
A．remnants
B．remainder
C．rest
D．remains
单项选择题
Skyscrapers also interfere with television reception, ______ bird flyways, and obstruct air traffic.
A．block
B．disturb
C．destroy
D．ruin
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