单项选择题

The student said there were a few points in the essay he ______ impossible to comprehend.

A. had found
B. finds
C. has found
D. would find
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单项选择题
It is not ______ much the language as the background that makes the book difficult to understand.
A. that
B. as
C. so
D. very
单项选择题
Linda was ______ the experiment a month ago, but she changed her mind at the last minute.
A. to start
B. to have started
C. to be starting
D. to have been starting
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