问题补充:
Is 48 hours the man-made satellite is made in our country to orbit the planet around?
A. it; that; where
B. it; when; that
C. it for; that it takes; that
D. it; that it takes; which
答案:
A. it; that; where
B. it; when; that
C. it for; that it takes; that
(答案→)D. it; that it takes; which
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