高等教育 / 新发展英语综合教程（二）
The wheel is important because _ _ _ _ _ _ _ .
A.it was man''s first real invention
B.all transportation depends on it
C.every machine depends on it
D.both B and C
A.it was man''s first real invention
B.all transportation depends on it
C.every machine depends on it
D.both B and C
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