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A
when
B
that
C
how
D
what
正确答案 :A
解析
本题考查句法——名词性从句。
句意:你可以留着那些旧果酱瓶。你永远不知道什么时候可能会需要它们。
A项:when可以引导宾语从句,且在从句中作状语。分析句子结构可知, “___ you might need them” 是宾语从句,且从句缺时间状语,应用连接副词when引导。符合题意,故选A。
B项:that引导宾语从句时无词义,且在从句中不作语法成分,只起连接作用。不符合题意,故排除。
C项:how引导宾语从句时,在从句中作方式状语。不符合题意,故排除。
D项:what引导宾语从句时,在从句中作主语、宾语等成分。不符合题意,故排除。
故本题答案为A。
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