look on 是向上看的意思么

题目

look on 是向上看的意思么
Help me Dont just look___while im trying to lift the sack
A.up B.in C.on D.at
正确答案是C,为什么?look on 有这个词组么?

答案

1.在一旁观看,袖手旁观 John took part in the game,but the rest of us just looked on.约翰参赛,而我们其余的人只是观看.They stood looking on while the man was robbed.正当那个人被抢劫时,他们却站在那儿袖手...