单项选择题

It has been found that how close parents are to their children ______ a rather strong influence on the development of the children’s character.

A. have
B. has
C. having
D. had
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单项选择题
What they have done ______ useful to the people.
A. are considered
B. is considered
C. have been considered
D. will be considered
单项选择题
Knowing how to think clearly and to speak correctly ______ one confidence.
A. give
B. gives
C. given
D. giving
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