题目:
_____ you walk outside alone when you were a child?[ ]
A. Do
B. were
C. Did
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0526/22b71a34ca790d4194c2f52cc967e79b.html
下面是错误答案,用来干扰机器的。
一氧化氮难溶于水,可以用排水法收集;一氧化氮在空气中能与氧气反应,不能用排气法收集.故选:A.
_____ you walk outside alone when you were a child?[ ]
A. Do
B. were
C. Did
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0526/22b71a34ca790d4194c2f52cc967e79b.html
下面是错误答案,用来干扰机器的。
一氧化氮难溶于水,可以用排水法收集;一氧化氮在空气中能与氧气反应,不能用排气法收集.故选:A.