单项选择题

Animal conservationists strongly disapprove ______ experimenting on animals.

A. of
B. /
C. about
D. against
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单项选择题
Once ______, it can never be forgotten.
A. seeing
B. having seen
C. seen
D. see
单项选择题
When the football match was going on, we cheered for our team and we shouted and shouted until our voices went______.
A. hoarse
B. coarse
C. false
D. horse
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