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after we walked ____ the forest ,-_____a river,we stopped to

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after we walked ____ the forest ,-_____a river,we stopped to take a rest
through;cross
through,across
after we walked ____ the forest ,-_____a river,we stopped to
是through,across
after we walked THROUGH the forest and ACROSS a river,we stopped to take a rest
再问: 为什么,逗号并列什么?
再答: 原句是错的,不规范。walked through the forest 和walked across a river是两个不同的动作,只不过谓语动词walked是一样的,这时候,就必须是walked through the forest and across a river,用and连接这两个短语。
再问: 什么时候才是并列两个短语呢?
再答: 记住:1 walked through A, across B , out of C AND onto / into D 2 walked through the forest AND swam acoss the river 最後一个与它前面的那个之间要用and连接
再问: '''''最後一个与它前面的那个之间要用and连接''''''什么意思?
再答: A,B and C -----B和C A and B -----A和B A,B,C and D-----C和D 相同成分的单词或短语之间,最後两个之间要用and连接