We can do a lot to stay healthy. __________, we should eat a balanced(平衡的) diet.
#77891
A
At a time
B
In fact
C
First of all
D
All together
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It was my fault. I ________you about the meeting earlier. 
#63052
A
should tell
B
should have told
C
had to tell
D
would have told
The manager demanded that the work________ within three days.
#62720
A
was finished
B
had been finished
C
be finished
D
finished