单项选择题

I tried hard, but I couldn’t find the ______ to the problem.

A. solution
B. help
C. reply
D. demand
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There are three colors in the British flag, ______ red, white and blue.
A. rarely
B. namely
C. really
D. naturally
单项选择题
I can’t find the key to my office. I ______ have lost it on my way home.
A. would
B. should
C. must
D. ought to
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