单项选择题

It is not so much the language ______the cultural background that makes the book difficult to understand.

A．but
B．nor
C．as
D．like
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单项选择题
We must______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
单项选择题
Although he refused to act on my suggestion, he had to admit that______ what I said.
A．it was something in
B．there was something in
C．it was something as for
D．there was something upon
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