THESE BOYS _____ IN THE GARDEN FOR THREE HOURS.A. ARE WORKING B. H...

39. - ON TAP KIEM TRA 45 LAN 2 ANH 10
ON TAP KIEM TRA 45 LAN 2 ANH 10

39. These boys _____ in the garden for three hours.

A. are working B. have been working C. will be working D. were working