单项选择题

The oil industry of India ______ two World Wars and withstood the economic, social and political upheavals of a particularly troubled century.

A．survived
B．has survived
C．was survived to
D． has been surviving
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单项选择题
The basic rock material is referred to ______.
A．as the matrix
B． be the matrix
C．by scientist to be the matrix
D．as being the matrix
单项选择题
Now a person works for a certain amount of money _____ he can pay for food and clothing.
A．in case
B． so that
C．as to
D．such as
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