【題目】I am not sure _______ Maria can come here on time or not.
A.when
B.why
C.if
D.whether

【答案】D
【解析】句意:我不確定瑪麗婭是否會按時來。when何時;why為什么;if是否;如果;whether……or not是否。根據(jù)or not可知,所以答案是D。

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