It is up to sb. to do sth.该句型为“该由某人做。。。”。该句型中up后的to是介词。It is up to him to clean our classroom today. 今天应由他做教室清洁。It is up to parents to teach their children manners. 该由父母教孩子礼貌。
be up to doing是什么意思 怎么造句？
It is up to sb. to do sth.
该句型为“该由某人做。。。”。该句型中up后的to是介词。
It is up to him to clean our classroom today. 今天应由他做教室清洁。
It is up to parents to teach their children manners. 该由父母教孩子礼貌。2013-10-17
忙于做某事，i'm up to working.2013-10-17
能……胜任……
Are you up to reading such difficult books?2014-12-17
