【題目】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】

考查賓語從句。know是及物動詞。后跟賓語從句;從句中有主語you, 有賓語them,故應(yīng)當(dāng)用關(guān)系副詞。when意為“什么時間”;how意為“怎樣”;where意為“在哪里”。句意為:你應(yīng)該留住那些舊醬瓶,你不知道什么時間可能會需要它們。故選A。

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