题干
— Look! The old man ______ a big box into the house.
— Let's go and help him.
A：pulls
B：pulled
C：is pulling
D：has pulled
答案(点此获取答案解析）
C
— Look! The old man ______ a big box into the house.
— Let's go and help him.
A：pulls
B：pulled
C：is pulling
D：has pulled
