求解析I wonder ______they have finished their homework.I wonder _____英语解答

求解析I wonder ______they have finished their homework.
I wonder ______they have finished their homework.A that B when C where D if

人气：300 ℃　时间：2019-08-22 11:19:50

解答

D 是否
翻译：我想知道他们是否已完成作业.
注：A 没有意义； B 什么时候（不能与完成时连用）； C 哪里,这三项与句意不符.