Who did the teacher_______the letter for the whole class?
问题描述：
Who did the teacher_______the letter for the whole class?
A has writeBhas writtenC have writeD having written
为什么选C?谢谢帮我分析!
答
是应选C,给你简单说说：
大意：老师让谁为全班写信?
首先说明,这里have和write只是碰了一面而已（碰巧挨在一起）,无任何关系.
将原句还原成陈述语序：
The teacher had who write the letter for the whole class.
此处have 用做"have sb.（who) do sth."表示让某人做某事.
另外,for the whole class 改为 to the whole class也可,两种表达都讲的通.
这样一看,A B D都在误导你认为此处have（has)是完成式的标志,对吧.