Many underdeveloped countries now claim, often
in concert
, that their natural resources are their own, to be developed and used as they wish.
【正确答案】
C
【答案解析】解析：句意：现在很多不发达国家常常是一致主张，他们的自然资源是他们自己的，应根据他们自己的意愿去开发利用。in concert一致地。in agreement一致。in turn依次。inconflict不一致。in response作为回答。