Do you know＿＿ could pass the exam?

A.that
B.if
C.what
D.which
求解析

Do you know the twins' ＿＿? (name) Do you know? Do you know尉迟 do you know England? Do you know these? Do you know what___ do you know _? Do you know that_chairman 数学题.do you know? do you know