1/We often shank hands when _____(introduce) to each other 2/after1、after _______(swim) in the swimming pool 2、/We often shank hands when _____(introduce) to each other 2/after

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1/We often shank hands when _____(introduce) to each other 2/after1、after _______(swim) in the swimming pool 2、/We often shank hands when _____(introduce) to each other 2/after
1/We often shank hands when _____(introduce) to each other 2/after
1、after _______(swim) in the swimming pool
2、/We often shank hands when _____(introduce) to each other 2/after

1/We often shank hands when _____(introduce) to each other 2/after1、after _______(swim) in the swimming pool 2、/We often shank hands when _____(introduce) to each other 2/after
1.swimming (介词后+doing)
2.introduced(= when we are introduced)
确保正确,

swimming 动名词短语
introducing 动名词,伴随状况的状语

参考:新月空中英语