问题
填空题
用单词的适当形式补全句子。
1. Emily ______________ (have) a great time in Shanghai last year.
2. You ______________ (sleep) on the train at that time.
3. I ______________ (take) some pictures last week.
4. ______________ (does) he see his mother yesterday?
5. I ______________ (go) to the park with my parents last Saturday.
答案
1. had 2. were sleeping 3. took 4. Did 5. went
，下列叙述中，对于Cl2在该反应中所起的作用说法正确的是（）。