_______ is necessary to lock the door when you leave.
A: This
B: It
C: That
D: I
A: This
B: It
C: That
D: I
举一反三
- _______ is necessary to lock the door when you leave.
- (you, lock, always) the door to your apartment when you (leave)
- Don't forget _________ (lock) the door when you leave the laboratory.
- Don't ______ to lock the door when you leave. A: ignore B: disregard C: neglect D: overlook
- Don"t forget to lock the door ______ you leave the room. A: after B: since C: for D: when