My teacher asked me ( )I was going to sing at the party and I said "Yes".

题目

My teacher asked me ( )I was going to sing at the party and I said "Yes".
A how B when C why D whether
理由?

答案

D
whether是否
how怎样
when何时
why为什么
后三个的词义错误
我老师当时问我是否要在晚会上演唱,我说：“是的”