Professor Liu has ________ teach psychology since he came to the Central China Normal University.
#104447
A
determination to
B
been determined to
C
been determining to
D
determined to
推荐题目
Your phone ______ for several minutes now. Why don’t you answer it?
#100562
A
had rung
B
rang
C
has been ringing
D
was ringing
He ___ Beijing for a long time.
#104491
A
has been away
B
has left
C
has been away from
D
left
Don’t worry. Your dog _____good care of while you are away on holiday next week. 
#102981
A
will take
B
is taking
C
will be taken
D
.has been taken