单项选择题

--Have your students ever seen the silent film
--No, they are too young （） the old film.

A. to seeing
B. have seen
C. to have seen
D. to have not seen

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单项选择题
It （） 12 rabbits to test a sample of vaccine, now it takes only 6.

A. used to taking
B. used to take
C. is used to take
D. was used to taking
单项选择题
If there are any new words,（）in a dictionary.

A. look them through
B. look them up
C. look them over
D. look them up and down
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