It was repairing the old clock that the old man spent the whole morning at home. 为什么用REPARING
人气:394 ℃ 时间:2019-08-21 19:03:35
解答
it指代的是the old man spent the whole morning at home. 所以题目变为 The old man spent the whole morning ( ) the old clock at home. spend (on) doing sth 所以:REPARING