单项选择题

I must apologize ______ not answering your letter in time.

A. from
B. for
C. due to
D. as a result of
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单项选择题
A new war broke ______ between the two countries.
A. out
B. down
C. up
D. off
单项选择题
It is a good habit to ______ new words in the dictionary.
A. look through
B. look like
C. look out
D. look up
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