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单项选择题
The mother and father ____ the nucleus, or the center, of the nuclear family.
forms
B: are formed by
C: in the form. of
D: form
A:
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He is considering _____ the house.
buying
B: to buy
C: bought
D: buys
A:
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She walked in front, with her dog _______ behind her.
to run
B: ran
C: running
D: run
A:
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