The old city wall ______ in the Ming Dynasty.
#103432
A
was been built
B
has been built
C
was built
D
had been built
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I ____ to go for a walk, but someone called and I couldn’t get away. 
#104696
A
was planning
B
planned
C
had planned
D
would plan
Ladies and gentlemen, please fasten your seat belts. The plane _________.
#102384
A
is taking off
B
takes off
C
has taken off
D
will be taken off