单项选择题

All _______ is a continuous supple of raw materials.

A．what is needed
B．thing needed
C．that is needed
D．is needed
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单项选择题
A．differenceB．difficultyC．dislikeD．discipline
A．difference
B．difficulty
C．dislike
D．discipline
单项选择题
A．pointsB．meansC．decidesD．tells
A．points
B．means
C．decides
D．tells
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