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【题目】You should keep those old jam bottles ----you never know ______ you might need them.

A. whenB. how

C. whatD. where

【答案】A

【解析】

考查宾语从句。know是及物动词。后跟宾语从句;从句中有主语you, 有宾语them,故应当用关系副词。when意为“什么时间”;how意为“怎样”;where意为“在哪里”。句意为:你应该留住那些旧酱瓶,你不知道什么时间可能会需要它们。故选A

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