begin to do sth.以及start to do sth.的现在完成时形式.

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• begin to do sth.以及start to do sth.的现在完成时形式.begin to do sth.以及start to do sth.的现在完成时形式是have begun to do sth.和have started to do sth.还是用be on?注意,我说的是begin to do sth.这个词组,不是begin这个单词.
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