both his sister and his brother basketballlayer.A.is B.am C.are D.be 求原因

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bothhissisterandhisbrotherbasketballlayer.A.isB.amC.areD.be求原因bothhissisterandhisbrotherbasketballla

both his sister and his brother basketballlayer.A.is B.am C.are D.be 求原因
both his sister and his brother basketball
layer.
A.is B.am C.are D.be 求原因

both his sister and his brother basketballlayer.A.is B.am C.are D.be 求原因
C
主语是两个人‘ his sister and his brother' ,故用复数