一．单项选择（每小题1分共30分）
1. —Why don’t you go to the movie with me, Betty?
—Because I ______ it before.
A. saw B. have seen C. see D. seeing
2. —Is Tom at home?
—No, he ______ to town.
A. has been B. has gone C. goes D. will go
3. My family has two dogs. One is white, ________ is black.
A. other B. another C. the other D. others
