单项选择题

In the hot sun the surface of the road seems wet, but that is only a(n) ______.

A. analogy
B. correlation
C. paradox
D. illusion
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单项选择题
I’ll go if you’re going, ______, I’d rather stay at home.
A. only if
B. if only
C. even if
D. if not
单项选择题
You （）have been more careful!

A. must
B. could
C. would
D. need
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