关兴杀潘璋:请教几道选择题?请说明理由

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1.If you are able to go, please tell me*** phone
A at B by C on D through
2.One third of the teachers in our school*** men teachers.
A are B is

1.by 词组
2.are 为复数

1.by
2.are

1 on
2 is