While he ______ , he ______ a sound outside the room.
举一反三
- The senior citizen wants a quiet room for one night because he just couldn’t stand ___ in a noisy room.
- If he has a sound body and a sound mind, he is very healthy physically and mentally.
- ________he has finished cleaning the room is unknown. A: If B: Whether C: When D: While
- ___, he left the room.
- I saw him enter the room. =He ______ the room.