Then he slowed ______ as the wind became stronger and the waves higher.
问题描述：
Then he slowed ______ as the wind became stronger and the waves higher.
答
Then he slowed down as the wind became stronger and the waves higher.
全句的意思是 然后,因为风变得越来越强和波浪变得越来越高,所以他的速度开始下降.(在过去发生)