单项选择题

As it turned out to be a small house party, we ______ so formally.

A. shouldn't have dressed up
B. needn't have dressed up
C. mustn't have dressed up
D. couldn't have dressed up
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单项选择题
Humble ______ it may be, there's no place like home, ______he may go.
A. like; when
B. as; wherever
C. although; where
D. which; wherever
单项选择题
The human race has already paid a heavy price for its slow ______ to environmental threats.
A. response
B. responsibility
C. resolution
D. resistance
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