Mother went shopping; , I cleaned the house.
A. while
B. when
C. and when
D. meanwhile
网友回答
A. while
B. when
C. and when
(答案→)D. meanwhile
解析：
meanwhile是一个副词，作“同时”解，meanwhile还可以用作名词，构成短语in the meanwhile与此同时；在此期间。例如： ①The train isn’t away for an hour; meanwhile, I am going to take a nap. 列车要过一小时才会发车。在这段时间里，我想去小睡一会儿。②Jack ran for a doctor；meanwhile we stayed with the patient。杰克跑去找医生，同时我们和病人呆在一起。