关于it happens that
问题描述：
关于it happens that
"It happens that he was in business" The sentence means that___
A.He happened to be on business
B.He happens to have been on business
为什么选B但A不对呢？
答
“碰巧他在进行商务会谈”这句话的意思是－－
当时他在进行会谈,这是过去进行时,所以是“have been ”