I wonder how long ago this radio factory-----a has begun b begins c began d has started
问题描述：
I wonder how long ago this radio factory-----
a has begun b begins c began d has started
答
i do not know what you want to say
答
选择：d
此句译为：我想知道这个无线电厂是在多久前开办的.无线电厂开办是已经发生的事情,故需用现在完成时态.
b 项为一般现在时态 c项为一般过去时态 这两项时态不正确,故排除!
剩余的a和d两项再来看,此两项都是现在完成时态,但工厂开办就只能用start
故正确选项为:d