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  3. Where to find the teacher and where to do the experiment______.

Where to find the teacher and where to do the experiment______.

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问题 Where to find the teacher and where to do the experiment______.
选项 A、are not known
B、is not known
C、has not known
D、have not known
答案A
解析 本题考查知识点是不定式做主语时谓语动词的数。句子结构是“疑问词+to do and+疑问词+to do”，谓语动词应为复数形式。但如果两个疑问词加不定式在句中作主语表示一件事的两个侧面，则谓语动词用单数。
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