【題目】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:沒有人知道托尼是否能按時到達。根據(jù)No one knows可知是“是否”,表達不確定的內(nèi)容,排除that,what;根據(jù)有or notwhether,不用if;故選B

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