单项选择题

David has ______ much work to do that he is staying late at his office.

A. such
B. so
C. very
D. enough
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I tried hard, but I couldn’t find the ______ to the problem.
A. solution
B. help
C. reply
D. demand
单项选择题
There are three colors in the British flag, ______ red, white and blue.
A. rarely
B. namely
C. really
D. naturally
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