MR JOHN DOES NOT KNOW ... THE LAWN MOVER AFTER THEY HAD FINISHED US...

4. - DE THI HSG ANH 9 KEYS POT
DE THI HSG ANH 9 KEYS POT

4. Mr John does not know ... the lawn mover after they had finished using it .

A. where did they put B. where they did

C. where they put

D. where to put

put