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We’re not sure ________ it will rain or ...

We’re not sure ________ it will rain or not tomorrow.

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

 

B 【解析】句意:我们不能确定明天是否会下雨。A. if“是否”;B. whether“是否”;C. that无实际意义; D. why“为什么”。因为if不与or not连用,只有whether与or not 连用。故选B。 【点睛】whether的用法 1. 在动词不定式之前只能用whether。如:I can't decide whether to stay. 我不能决定是否留下。 2. 在whether …… or not 的固定搭配中。如:I want to know whether it's good news or not. 我想知道是否是好消息。 3. 在介词后,只能用whether。如:His father is worried about whether he lose his work. 他的父亲担心是否会失去工作。  
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