请帮我看看这句英文对吗?

题目

请帮我看看这句英文对吗?
Mr Wang is business trip in Beijing these days.If you want to reach him please call jenny.
中文是：
王先生这几天在北京出差,如果你想找他请电话jenny.
是否因该是：
Mr.Wang is on business trip in Beijing these days.

答案

不对
Mr wang is on a(his) business trip in Beijing these days.If you want to contact him please call jenny.
少个介词