问题

__ girl dropped into that well yesterday.__ I’m sorry to hear that. I know it is_________. .[ ]

A: A 6 years old; 20-metre-deep
B: A 6 -year-old; 20 meters in depth
C: A 6-years -old; 20 meters deep
D: A 6-year- old; 20 meter deep
正确答案是: