may can must should could would
题目
may can must should could would
如何区分.有例题
1.____you wait a few more minutes?It'll be your turn soon
Amust Bshould C could Dmight
2_____I smoke here?no you are not allowed to smoke in public place
Acould Bmust C may Dmight
答案
1,c,表请求别人委婉语气,could
2,c ,征求意见,may
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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