1.These books eaach___ too much .A.cost B.costs 选哪个?cost的过去式跟原形一样，过去时用A可以吗？

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1.These books eaach___ too much .A.cost B.costs 选哪个?cost的过去式跟原形一样，过去时用A可以吗？
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1.These books eaach___ too much .A.cost B.costs 选哪个?cost的过去式跟原形一样，过去时用A可以吗？
1.These books eaach___ too much .A.cost B.costs 选哪个?
cost的过去式跟原形一样，过去时用A可以吗？

1.These books eaach___ too much .A.cost B.costs 选哪个?cost的过去式跟原形一样，过去时用A可以吗？
B
动词前面加了个each,主语变成了each,成了单数,所以后面的动词要用第三人称单数.

each指每一个，为单数，选B

选A，主语是these books，不是each，each是同位语，但是不能决定谓语的单复数形式。

b
因为books后面有each，所以就代表是每一本书，所以就是要用单数

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