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单选题
52._____how to solve the mathematics problem, Stephanie asked her teacher for help.
A
Not known
B
Not knowing
C
Not to know
D
Not know
答案解析
正确答案：B
解析：
解析:由于不知道如何解答这道数学题,斯蒂芬妮向她的老师寻求都助。
分析句子结构可知,空处应用非谓语动词。根据句意可知,Stephanie 和know 之间是逻辑上的主谓关
系,且句中没有明显的表示时间先后顺序的词,所以应用现在分词形式,表示主动,其否定形式是直接在现在分词前面加not。故选B。
分析句子结构可知,空处应用非谓语动词。根据句意可知,Stephanie 和know 之间是逻辑上的主谓关
系,且句中没有明显的表示时间先后顺序的词,所以应用现在分词形式,表示主动,其否定形式是直接在现在分词前面加not。故选B。
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