It was (the heavy) rain that prevented him (from) going to work yesterday.我弄错了 应该是 it rained heavily, so he did not go to work yesterday 同义句 the_ rain____ him going to work yesterday.呵呵，那就填heavy，stopped / prevented ，我之前给的是个强调句：）是heavy ？？不是 heavily吗？一定是heavy，形容词修饰后面的名词rain。而之前的it rained heavily中rain是动词，所以用副词修饰。