The development of new energy sources______to be rewarding.A、turned outB、turned

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问题 The development of new energy sources______to be rewarding.

选项 A、turned out
B、turned up
C、turned back
D、turned away

答案 A

解析本题句意：开发新能源被证明是值得的。turn out“结果证明”，turned up“出现”，turned back“返回”，turned away“转身，拒绝”。故选A。

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