单项选择题

I walked three kilometers yesterday and am ______ it now; my legs hurt.

A. paying
B. paying for
C. paying back
D. paying off
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The reason ______ his going to France was ______ he got a new job there.
A. for... because
B. for... that
C. of... because
D. of... that
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.
A. when
B. since
C. before
D. after
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