题干
— Tom, what's that in the tree?
— __________.
A：It's a bag
B：That's cat
C：This is a bird
D：They're birds
答案(点此获取答案解析）
B
— Tom, what's that in the tree?
— __________.
A：It's a bag
B：That's cat
C：This is a bird
D：They're birds
