when l was young,l used ...(swim) in that river.用所给动词的恰当形式填空.

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when l was young,l used ...(swim) in that river.用所给动词的恰当形式填空.

when l was young,l used ...(swim) in that river.用所给动词的恰当形式填空.
when l was young,l used ...(swim) in that river.用所给动词的恰当形式填空.

when l was young,l used ...(swim) in that river.用所给动词的恰当形式填空.
when l was young,l used (to swim) in that river.
注:固定用法used to do sth 过去常常做某事
加油!不明白再问!

to swim

to swim
used to do过去常常做某事

填不定式to swim
used + 动词不定式 是一种固定搭配,表示过去习惯于做某事(且含有现在已经不再这样的暗示)



【有一个易混词组,be used to doing 这里used前面要加be动词,to作介词,表示习惯于做某事】