英语单项选择、最好能说明为什么
题目
英语单项选择、最好能说明为什么
1.I want to know _____________the new mobile phone last week.A.how much she paid for B.how much will she pay for C.how much did she pay for D.how much she will pay for
2.Great changes_____________ in China in the past few years.A.have happened B.have taken place C.have been happened D.have been taken place
答案
A . 宾语从句用陈述句语序, 排除B和C, 句中有last week , 要用过去时. 排除D . 故A正确.
B take place 和happen 都是不及物动词, 不用被动语态,排除 C和D. 变化的发生 用 take place . 故B正确 .
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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