【題目】No one knows ___ the professor will come to our school tomorrow to give us a talk or not.

A. when B. whether C. where D. if

【答案】B

【解析】

句意:沒有人知道明天這個教授是否會來我們學校給我們做演講。when什么時候,whether是否,where在哪里,if是否根據(jù)句子后面的or not可知,這里用到whether…or not, 雖然if也可以表示是否,但是不能和or not連用。故選B。

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