单项选择题

This painting lacks ______.

A. ratio
B. rate
C. proportion
D. percentage
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单项选择题
Animal conservationists strongly disapprove ______ experimenting on animals.
A. of
B. /
C. about
D. against
单项选择题
Once ______, it can never be forgotten.
A. seeing
B. having seen
C. seen
D. see
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