If you --- (not know)the answer,you'd better ----(put)up you

问题描述:

If you ___ (not know)the answer,you'd better ____(put)up your hands.怎么写,急
1个回答 分类:英语 2014-10-05

问题解答:

我来补答
don't know,put
if主将,从现.you 一般现在时的否定句用:don't + 动词原形
had better do sth.最好做某事,所以用动词原形
 
 
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