单项选择题

Television is another major instrument of communication,（）us to see as well as to hear the performer.

A. permitted
B. permitting
C. to permit
D. have permitted

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单项选择题
So many representatives（）, the conference had to be put off.

A. were absent
B. to be absent
C. being absent
D. had been absent
单项选择题
He spent（）collecting materials for his article.

A. a half year
B. half year
C. half a year
D. half of a year
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