题干
----Is this your pen? ---- .It's Tony's pen.
A：Yes, it is
B：No, it isn't
C：Yes, I am
D：No, I am not
答案(点此获取答案解析）
B
----Is this your pen? ---- .It's Tony's pen.
A：Yes, it is
B：No, it isn't
C：Yes, I am
D：No, I am not
