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information in the long term memory can be recalles at a lat

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information in the long term memory can be recalles at a later time____
A than is needed B,when it is to be needed
C needed D when needed
0-0 为啥米?
when needed 属于省略句,相当于when it is needed .
再问: 0-0 省略句??? 那不是应该把 when 一起省略么????
再答: 这是从句的一种省略,如:I won't go to her party unless invited.