We can protect our country by _____ the air,the water and the land.
题目
We can protect our country by _____ the air,the water and the land.
A.not polluting B.not pollute C.not to pollute D.to not pollute解释!
答案
We can protect our country by (A.not polluting) the air,the water and the land.
我们可以通过不污染空气、水和土地,来保护我们的国家.
by doing,通过某种手段方式.在介词by的后面要用动名词doing的形式作宾语,不能用不定式to do,而否定词not要放在doing之前.
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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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