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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