After ___the rubbish away,the boy ran back to his seat.A throw B throwing C have thrown
题目
After ___the rubbish away,the boy ran back to his seat.A throw B throwing C have thrown
D being thrown
应该选哪个?为什么?
答案
选择B
这里首先知道,介词after后面加上动词ing形式,所以排除了A和C
另外要明白后面句子的主语the boy和throw(仍)是主动的关系,所以排除被动的D
综上,选择B
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.
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