John said that the richer countries of the world should make a______effort to he

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问题 John said that the richer countries of the world should make a______effort to help the poorer countries.

选项 A、futile
B、glittering
C、frantic
D、concentrated

答案 D

解析形容词词义辨析。由题干中的effort可以判定D项符合上下文语义，make a concentrated effort意为“全力以赴，专心”。

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