1. He ____ at tennis since he came to the USA.

A. isn't beaten
B. hasn't beaten
C. hasn't been beaten
D. wasn't beaten

2.We all got a surprise when the boss suddenly____

A. was appeared
B. appeared
C.had appeared
D. has appeared.

3.They can't help us____ the house.
A. move
B. moving
C. moved
D. move to​