单项选择题

The police have installed cameras at dangerous road ______ to film those who drive through red traffic lights.

A. trenches
B. utilities
C. pavements
D. junctions
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单项选择题
As teachers we should concern ourselves with what is said, not what we think ______.
A. ought to be said
B. must say
C. have to be said
D. need to say
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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