Not ______ (know) how to do the math problem, she came to ask her brother.

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问题 Not ______ (know) how to do the math problem, she came to ask her brother.

选项

答案knowing

解析本题考查句子结构。两个分句之间没有并列连词，不构成并列句，应为伴随状态。主语为she，动词为know，应为主动，用-ing形式。该句意为：不知该如何做这道数学题，她去询问她的哥哥。

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大学英语三级B级

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