题目:
句型转换。
1. He is so young that he couldn't go to school. (改为同义句)
He is _____ _____ _____ _____ to school.
2. I prefer to do sports rather than watch TV at home. (改为虚拟语气)
I _____ _____ do sports _____ watch TV at home.
3. Do you have other things I can do for you? (改为同义句)
Do you have _____ _____ I can do for you?
4. It's a pity that I can't further my research work because I have no chance. (改为同义句)
If I _____ a chance, I _____ further my research work.
5. I had to do my homework at home yesterday. (改为一般疑问句)
_____ you _____ to do your homework at home yesterday?
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:根据在化合物中正负化合价代数和为零,可设CaF2中F元素的化合价为x,则:(+2)+2x=0,则x=﹣1