题干
It is not until ______ that ______.
| A．is a baby kangaroo four months old; he will begin to live outside its mother’s pouch |
| B．is a baby kangaroo four months old; will he begin to live outside its mother’s pouch |
| C．a baby kangaroo is four months old; he will begin to live outside its mother’s pouch |
| D．a baby kangaroo is four months old; will he begin to live outside its mother’s pouch |
答案(点此获取答案解析）
