The computer( )last week has gone wrong .A.which I bought it B.I bought
题目
The computer( )last week has gone wrong .A.which I bought it B.I bought
为什么?
答案
The computer ( B.I bought ) last week has gone wrong .我上周买的电脑出问题了.这一空里要填定语从句,修饰先行词computer.引导词应该为which或that,在定从中做宾语,可以省略.A项的which I bought it错在多了个it,...
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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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