I have been in china six months等于 ( )( )six months since I came to china

问题描述:

I have been in china six months等于 ( )( )six months since I came to china

这道题如果不限几个单词的话,可以有两种答案.
It is six months since I came to china.
It has been six months since I came to china.
因为只给了两个空,所以应该用 It is .