If 3 boys can do 3 times of a particular work in 3 days, then, 7 boys can do 7 times of that work in?  Choose the correct choice from the following choices.
A) days
B) days
C) days
D) days
E) days
That is, 1 boys can do one time of the work in 3 days.   Therefore, 7 boys can do 7 times work in the same 3 days itself.   days)
<result>B</result>
If 3 boys can do 3 times of a particular work in 3 days, then, 7 boys can do 7 times of that work in?