How long do you think it will beChina becomes a rich and harmonious country?A. beforeB. af

问题补充：

How long do you think it will beChina becomes a rich and harmonious country?

A. before

B. after

C. since

D. when

答案：

(答案→)A. before

B. after

C. since

D. when

解析：可联系答.案.网客服索取。