问题描述：
一道英语问题求讲解,下列括号内的词为什么要用ing形式?
The hotel holiday is still a winner,with about one third of all Americana （preferring） to go on a self-catering holiday.
The hotel holiday is still a winner,with about one third of all Americana （preferring） to go on a self-catering holiday.
问题解答：
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