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--Tom,________ students are there in your class?

--________.

A．How much,Thirty one

B．How many,Thirty one

C．How many,Thirty--one

D．How much,Thirty--one

--Tom,________ students are there in your class?

--________.

A．How much,Thirty one

B．How many,Thirty one

C．How many,Thirty--one

D．How much,Thirty--one