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
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—Hi, Jack! When did you arrive in Berlin?—Last weekend .I         a different culture since then.
#101417
A
was experiencing
B
will be experiencing
C
have been experiencing
D
had been experiencing
Why did you just sit and watch? You _______ me.
#104478
A
could help
B
should help
C
could have helped
D
must have helped
—The window is dirty.—I know. It ______ for weeks.
#102943
A
hasn’t cleaned
B
didn’t clean
C
wasn’t cleaned
D
hasn’t been cleaned
Let’s keep to the point or we ______ any decisions. 
#104991
A
will never reach
B
have never reached
C
never reach
D
never reached