Once she _______ her mind, nothing can change it.
#101619
A
made
B
make
C
has made
D
will make
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The whole family were sound asleep when the disaster_____.
#100787
A
had taken place
B
took place
C
is taking place
D
has taken place
 We    on it for several hours but we haven't yet reached any conclusion. 
#99883
A
are working
B
work
C
have been worked
D
have been working