I__(wait)for him for the last twenty minutes.

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I__(wait)for him for the last twenty minutes.
x)(O,L/RU% 9% %y% y%z6IE$/!ǖIJT<̼t<;6`SXo9+y1/ext

I__(wait)for him for the last twenty minutes.
I__(wait)for him for the last twenty minutes.

I__(wait)for him for the last twenty minutes.
have been waiting

for the last twenty minutes是现在完成进行时的标志,所以用have been waiting