there a lot of visitor in his house,he has no time to talk with you.there a lot of visitor in his house,he has no time to talk with you.A.are B.being 为什么不选A?

there a lot of visitor in his house,he has no time to talk with you.there a lot of visitor in his house,he has no time to talk with you.A.are B.being 为什么不选A?
there a lot of visitor in his house,he has no time to talk with you
.there a lot of visitor in his house,he has no time to talk with you.
A.are B.being 为什么不选A?

there a lot of visitor in his house,he has no time to talk with you.there a lot of visitor in his house,he has no time to talk with you.A.are B.being 为什么不选A?
一个句子只能有一个谓语（可以是系动词也可以是实义动词）,题目是一个句子,而后面部分he has no time to talk with you是主干,there being a lot of visitors in his house可以理解为后面部分的原因,是一个状语,不能独立成为一个句子,如果要成为句子必须要用相关的连接词连接比如so（所以）.相关例子还有：
Walking in such an empty street,he feels very afraid.
With a lot of homework to do,he decided not to watch TV.
其中前一句是动名词做状语表示伴随,后一句是介词短语作状语表示原因.