all work is pleasant ____when the habit of working is forming A.dong B.doing C.to do D.to be dong
问题描述：
all work is pleasant ____when the habit of working is forming A.dong B.doing C.to do D.to be dong
请选择正确答案,并加以解释.要用被动语态吗?
答
选择C
解释：这是典型的主动表被动的句型：sth+ be+ adj + to do sth
如：
Chinese is easy to learn. （汉语容易学.）
English is difficult to learn. （英语难学.）
The chair is comfortable to sit on. （那张椅子坐上去很舒服.）