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

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.

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