问题补充：
Living things are dying out quickly.Let’s askdestroying the in the pastyears.
A. what part people have been playing
B. people have played in
C. what part people have played in
D. people have been playing what part
答案：
A. what part people have been playing
B. people have played in
(答案→)C. what part people have played in
D. people have been playing what part
解析：可联系答.案.网客服索取。
