收发电子邮件时，接收方必须了解对方电子邮件地址才可发回函。
查看答案
He is now ______ in Shanghai.
A. living
B. lives
C. live
D. lived
Jane ______ law while her sister ______ physics.
A. studies, does
B. is studying, does
C. is studying, is doing
D. studies, is doing
I ______ English at the Teachers’ College, but I am now ______ in a middle school.
A. taught, teaching
B. teach, teaching
C. taught, teach
D. will teach, teach
The postman ______ your letters into my letter-box.
A. is always putting
B. is always put
C. are always putting
D. are always put
微信支付 
支付宝支付