We Acould see how various Bfactors cause periods of global warming and cooling C

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问题 We Acould see how various Bfactors cause periods of global warming and cooling Conly if we combine past data Dwith current knowledge.

选项 A、
B、
C、
D、

答案 A

解析 Could is an incorrect modal in the result clause of this future real conditional sentence. Correction: can.

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