Nobody ______ to go into the laboratory without permission (允许).
#44894
A
allows
B
is allowed
C
promises
D
is promised
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Great changes _______ in our country since 1990.
#44952
A
were taken place
B
took place
C
have taken place
D
have been taken place
 Dad, my computer is broken. Must it _____ now?
#44599
A
is repaired
B
has been repaired
C
be repaired
D
has repaired
—Mr. Black, may I leave now?—Well, if your work ________, you can go home.
#44700
A
finishes
B
is finished
C
has finished
D
will be finished