Question

【题目】—Do you know________？

—Sorry，I don’t know．

A．if she will come to the concert or not

B．whether she will come to the concert or not

C．if will she come to the concert

Answer 1

【答案】B

【解析】宾语从句要用陈述句语序，可先排除C；宾语从句中有or not，故只能用whether，不能用if。故答案为B。