单项选择题

Once ______, it can never be forgotten.

A. seeing
B. having seen
C. seen
D. see
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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
单项选择题
If ______, these suggestions will make disastrous earthquakes almost a thing of the past.
A. following
B. follow
C. to follow
D. followed
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