my parents ________(clean)the house at night yer

问题描述:

my parents ________(clean)the house at night yer
stday morning.

cleaned?如果题目是at nine yesterday morning 那就只能是was cleaning

你写错了, 不是night, 是【nine】!!!!!!!!!!!!!!!就是night绝对不是!!
at nineyesterday morning "昨天早上九点钟“
用were cleaning, 表示在"昨天早上九点钟“正在做的事, 强调当时的情景

再说, 如果是at nightyesterday morning , 这个也讲不通呀!!!!哦,原来是这样,那就是题目印错了,谢谢,