单项选择题

-- Sorry, I made a mistake again.
-- (). Practice more and you'll succeed.

A. Not at all
B. Certainly not
C. Never mind
D. Don' t mention it

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The factory produces half a million pairs of shoes every year, 80% () are sold abroad.

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C.of them
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The Parkers bought a new house but () will need a lot of work before they can move in.

A. they
B. it
C. one
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