"I don’t think Prof. Smith meant to be funny this morning, do you?""No, although I couldn’t help ______ at some of his remarks."

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问题 "I don’t think Prof. Smith meant to be funny this morning, do you?""No, although I couldn’t help ______ at some of his remarks."

选项 A、from laughing
B、to have laughed
C、to laugh
D、but laugh

答案D

解析 cannot help but+不定式,意思为“不得不”。
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