It’s ten o’clock. I have to ______.      
#59737
A
go to the bed
B
go bed
C
go to bed
D
go to a bed
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——Who is knocking at the door?——It ______ Mr. Black, because he_______Washington.
#54792
A
can't be;has gone to
B
may be;has been to
C
must’t be;has gone to
D
may be;went