UsuallyweuseXasthesymbolanunknownwordorawronganswer.A.ofB.forC.toD.in...可是答案是B

Question

Usually we use X as the symbol____an unknown word or a wrong answer.
A.of
B.for
C.to
D.in
...可是答案是B

Answer 1

for有代表的意思
可以翻译成通常我们使用符号X代表未知数或者错误答案