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2. whether和if都意为“是否”,通常情况下,二 者都可以引.导宾语从句,但在介词之后或直接与

连用时,只能用whether,不能用if。

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阅读下面材料,在空白处填入适当的内容(1个单词) 或括号内单词的正确形式。


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