The fadtory has been here since the 1970s 划线部分(since the 1970s )提问 ———(三个空)the factory been here?

问题描述:

The fadtory has been here since the 1970s 划线部分(since the 1970s )提问 ———(三个空)the factory been here?

填:
How long has
这家工厂已经在这多久了?