A.He knew this beforehand.B.He judged from time zones.C.He made such a judgment so as

外语类 成人英语三级 已帮助 人

A.He knew this beforehand.

B.He judged from time zones.

C.He made such a judgment so as to Wang.

D.He gave such an explanation because he analyzed the speeds of sound and electricity.

热搜:a是b的充分条件,b是a的必要条件吗