专四
A.based
B.basing
C.to base
D.to be based
考查非谓语动词。此处过去分词短语based on our memory ofwhat has gone before作主句的状语。base on意为“以……为依据”,基本用法有base sth.on sth.和sth.be based Oil sth.,取决于前后二者的关系是主动还是被动。在本句中,0ur memory of...是“被基于”的事物,因此要用被动态。
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根据以下资料,回答题:
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