DON’T FORGET ___________ THE DOOR BEFORE ____________ TO BED.A. TO...

49. - ON TAP TRAC NGHIEM 2 LOP 5
ON TAP TRAC NGHIEM 2 LOP 5

49. Don’t forget ___________ the door before ____________ to bed.

A. to lock/ going

B. locking/ going C. to lock/ to go D. lock/ going