单项选择题

______ is careless when disposing of his wastes.

A. It is man
B. Man
C. Man who
D. A man
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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
The students will put off the match until next week, ______ they won’t be so busy.
A. since
B. as
C. when
D. while
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