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The professor, ______ whether anyone would come to help him, had to prepare for the experiment by himself.
分类:
综合英语(二)(00795)
发表:2024年09月12日 08时09分54秒
作者:
admin
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The professor, ______ whether anyone would come to help him, had to prepare for the experiment by himself.
A、did not know
B、having not known
C、had not known
D、not knowing
【正确答案】:D
【题目解析】:句子的谓语是had to prepare for,第二动词应该用非谓语动词。动名词的否定形式是直接在其前加not。答案为D。
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