Police are looking into the disappearance of two children these days.

问题描述:

Police are looking into the disappearance of two children these days.
A.are looking into
B.have been looking into
问:为什么选A,后面时间“these days"不是一段时间吗?表一段时间该用完成时啊

你觉得these days these days 是一个很常用的词组,意思相当于“目前”“现在”,那你说选A还是B?