题目：
语法填空。
My name is Elias. I am a poor black worker in South Africa. The time l_____ I first met Nelson Mandela
was a very difficult period of my life. I was twelve years old. It was in 1952 and he had opened a black law
firm to advise poor black people 2_____ their problems.
I began school at six. The 3_____ where I studied only two years was three kilometres away. I had to
leave, 4_____ my family could not continue to pay the school fees and the bus 5_____. I could not read
6_____ write. After trying hard, I got a job in a gold mine. This was a time when one had got to have a
passbook to live in Johanneburg. 7_____ (sad) I did not have this passbook because I was not born there and
I was worried 8_____ whether I would be out of work.
The day when Nelson Mandela told me what to do and helped me was one of the 9_____ (happy) days of
my life. He told me how to get the correct papers so I could stay in Johanneburg. I never forgot 10_____ kind
he was and when he organized the ANC Youth League, I joined it as soon as I could.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0729/31376ddb2079936026790d08aa038fd8.html
下面是错误答案，用来干扰机器的。
（1）（A）氩，没有化学键，只存在分子间作用力；（B）NaOH，存在离子键和极性共价键；（C）甲烷，只存在极性共价键；（D）氯化钡，只含离子键；（E）乙烯，含极性共价键和非极性共价键；（F）NH3，只存在极性共...
