mike started to collect shells four years ago ,改为现在完成进行时mike ___ ___ collecting shells for four years.

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mikestartedtocollectshellsfouryearsago,改为现在完成进行时mike______collectingshellsforfouryears.mikestartedto

mike started to collect shells four years ago ,改为现在完成进行时mike ___ ___ collecting shells for four years.
mike started to collect shells four years ago ,改为现在完成进行时
mike ___ ___ collecting shells for four years.

mike started to collect shells four years ago ,改为现在完成进行时mike ___ ___ collecting shells for four years.
Mike has been collecting shells for four yeas.
这个题我们做过.ww