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【题目】No one knows _______or not Tony can arrive on time.

A. if B. whether C. that D. what

【答案】B

【解析】

句意:没有人知道托尼是否能按时到达。根据No one knows可知是“是否”,表达不确定的内容,排除that,what;根据有or notwhether,不用if;故选B

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