Question

I don’t know how long it’ll be　　　I get the bandage off my arm.

A. before　　B. since　　　C. after　　　D. unless

Answer

【解析】选A。考查状语从句。此处句意为: 我不知道还要多久我才能取下胳膊上的绷带。此处before意为“(表示要先发生某事或过一段时间之后才会发生另一件事)在……之前”。

【变式训练】

(2013·杭州模拟)—So you know Catherine?

—Yes, it was last week she came to visit my roommate Jane.

A. thatB. whenC. sinceD. before

选B。考查强调句的省略用法。答句句意: 是的, 是在她上星期来拜访我室友Jane的时候我认识她的。last week后when所引出的是定语从句, 完整的回答是: It was last week when she came to visit my roommate Jane that I got to know Catherine. 所以答案选B。