A dviver is asked to keep his safety belt __ while driving on the freeway

A dviver is asked to keep his safety belt __ while driving on the freeway

题目
A dviver is asked to keep his safety belt __ while driving on the freeway
答案为fastened driving 求这个试题的考点.为什么是这个答案.
答案
过去分词表形容词.keep sth adj保持某物如何如何,如keep your mouth open.
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