Mobile phones have made possible for us to reach out to the farthest corners of the world from our homes.
A.them
B.that
C.this
D.it
答案:D
考查it作形式宾语。但句子中的宾语从句内容较长时,可以用it代替从句内容放于动词后面,实际宾语放到句子末尾。本句中it指代to reach out to the farthest corners of the world from our homes.故选D。其它选项没有这个用法。