问题补充：
The Parkers bought a new house, but will need a lot of work before they can move in.
A. they
B. it
C. one
D. which
答案：
A. they
(答案→)B. it
C. one
D. which
解析：it在句子中的指代The Parkers所买的房子。在英语中，如果所指的是同种事物要用代词it和they（them）；如果指代的是同一类事物要用代词one和ones。
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