The answer must ______ finding new sources of energy.A、happen toB、turn outC、li

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问题 The answer must ______ finding new sources of energy.

选项 A、happen to
B、turn out
C、lie in
D、lay in

答案 C

解析根据句意，方法是要找到新的能源，只有C lie in意为“在于……”，满足句子要求。

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