He didn’t go to school yesterday _______ he was ill.
A. because B. because of C. if D. so
He didn’t go to school yesterday _______ he was ill.
A. because B. because of C. if D. so
A
【解析】A考查连词的用法。because引导的状语从句,根据句意:他昨天没来上学是因为生病了。B后面接名词或名词性短语。D经常与that搭配引导目的或者结果状语从句。故选A。