单项选择题

Plastics today contribute to a wide ______ of industries.

A. field
B. area
C. scope
D. range
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单项选择题
When he arrived, he found ______ the aged and the sick at home.
A. none but
B. none other than
C. nothing but
D. no other than
单项选择题
The relationship between employers and employees has been studied ______.
A. originally
B. extremely
C. violently
D. intensively
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