题干
一 A stranger is walking ahead of us.
一 No. It's not a stranger. It's Mike's father.
A：in front of
B：behind
C：in the middle of
答案(点此获取答案解析）
A
一 A stranger is walking ahead of us.
一 No. It's not a stranger. It's Mike's father.
A：in front of
B：behind
C：in the middle of
化简为