4.The use of satellites makes __________ possible to watch events ______________ they happen thousands and thousands of miles away.A.it,as B.it,when C.this,when D.that,whether为什么啊
问题描述：
4.The use of satellites makes __________ possible to watch events ______________ they happen thousands and thousands of miles away.
A.it,as B.it,when C.this,when D.that,whether
为什么啊
答