单项选择题

______ vermin ______ much harm to poultry.

A. These, do
B. This, does
C. That, do
D. Those, does
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单项选择题
The public ______ to express their opinions about the affair.
A. are invited
B. are inviting
C. is invited
D. is inviting
单项选择题
Please feel free to ask the ______ in the city, if necessary.
A. passers-by
B. passer-by
C. passer-bys
D. passers-bys
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