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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