His math is poor,you must ________ him.A.try help B.trying to help C.try to help
题目
His math is poor,you must ________ him.A.try help B.trying to help C.try to help
答案
C.
他的数学不好,你一定要尽力帮助他
must是情态动词,情态动词后用动词的原型所以删除B
try to do sth.是尽力做某事的意思,.
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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