题目内容：

There are a lot of clouds in the sky. it's going to rain.(……）.the north wind begins to blow.
这是个选择题,括号内是选象.
我选的是 I don't think so.
为什么是 so it is ?

优质解答

so it is的意思是"确实如此",后面的补充"the north wind begins to blow(开始刮北风了)"就是肯定了前面说的要下雨,因此不能选"I don't think so"
注意so is it(它也是)与so it is (它的却是)的区别:
You dog is cute(可爱).So is my dog.(我的狗也可爱)
You dog is cute.So it is (它确实可爱).