单项选择题

In the preface ______ the book, the old scholar attaches great importance to practicalness.

A. to
B. for
C. about
D. of
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单项选择题
As soon as the boy was able to earn his own living he ______ his parents' strict rules.
A. defied
B. refuted
C. excluded
D. vetoed
单项选择题
I know him ______ but I have never actually spoken to him.
A. from sight
B. by sight
C. in sight
D. for sight
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