The development of new energy sources______to be rewarding.

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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

解析本题考查动词短语辨析。句意：结果证明新能源的开发是值得的。turned out“证明是，结果是”；turned up“出现，发生”；turned back“回来，(使)折回”；turned away“走开，解雇”。根据句意，本题选A。

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成人本科学位英语

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