Helen ( ) her keys in the office so she had to wait until he

来源：学生作业帮编辑：搜搜考试网作业帮分类：综合作业时间：2024/07/10 19:34:25

Helen ( ) her keys in the office so she had to wait until her husban ( ) home.
A.has left,comes B.left; had come C.had left; came D.had left; would come
答案是选C把,为什么

根据句中的had,可得知是对【已发生事情】的描写,故宜用过去时态,排除A.
接下来排除B,需分清这两个动作的先后.
排除D的理由是：【主将从现】即条件、时间状语需用一般时代替一般将来时,用一般过去时代替过去将来时.

Helen ( ) her keys in the office so she had to wait until he Helen _____ her keys in the office so she had to wait until Helen had left her keys in the office so she had to wait unt Helen had lost her keys in the office so she had to wait unt 英语15.Helen _______ her keys in the office so she had to wait Helen _______ her keys in the office so she had to wait unti Helen___her keys in the office,so she had to wait until her Helen___her keys in the office so she had to wait until her 10.Helen ___ her key in the office so she had to wait until Bob had left his keys in the office,so he had to wait until Mrs Smith____her keys in the office.so she had to wait until 16.Mrs Smith----- her keys in the office so she had to wait