I know your two sisters.( )of them coming?A.Are either B.Are all C.Is either D.Is all

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I know your two sisters.( )of them coming?A.Are either B.Are all C.Is either D.Is all
I know your two sisters.( )of them coming?A.Are either B.Are all C.Is either D.Is all

I know your two sisters.( )of them coming?A.Are either B.Are all C.Is either D.Is all
C
either表示两者其中之一,所以用单数is