Her remarks left me wondering______she could have changed so suddenly.

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问题 Her remarks left me wondering______she could have changed so suddenly.

选项 A、when
B、how
C、whether
D、that

答案B

解析 when，whether，how以及that均可以引导宾语从句，但含义不同。when：何时；how：如何，怎么；whether：是否；that在宾语从句中无实义。根据句意，选B。

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