Susan is the only one of the girls who ( )good at swimming.A.have been B.are C.isD.was
问题描述：
Susan is the only one of the girls who ( )good at swimming.A.have been B.are C.isD.was
答
B（根据语法）
但这句话本身就逻辑混乱,出题者显然思路不清.