[单选题]题目25未回答满分1.00未标记标记题目The development of new energy sources _____ to be rewarding.
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2024-02-03 16:06:25
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[单选题]题目25未回答满分1.00未标记标记题目The development of new energy sources _____ to be rewarding.

a. turned back
b. turned away
c. turned out
d. turned up
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