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【题目】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:我不确定玛丽娅是否会按时来。when何时;why为什么;if是否;如果;whether……or not是否。根据or not可知,所以答案是D。

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