[题目]I am not sure Maria can come here on time or not.A.whenB.whyC.ifD.whether 题目和参考答案——青夏教育精英家教网—

题目内容

【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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