2. 外语
  3. The development of new energy sources______to be rewarding.

The development of new energy sources______to be rewarding.

admin2019-06-25  68
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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