—Who do you think will win the first prize in your class this time?

问题描述:

—Who do you think will win the first prize in your class this time?
—The one _________hardest.
A.is working B.working C.works D.who working
为什么选B?

B working=who is working
这里是一个省略句,完整的句子应该是
The one (who is ) working hardest will win the first prize
working是现在分词,表示主动