This math problem is so difficult that only ( ) students can work it out A.a few B.few

his math problem is so difficult that only ( ) students can work it out A？.a few B.few 我选了b 可是书后答案却选a为什么

有 only 时填 a few ，表示肯定，虽然难，但还是有人能回答这个问题。
如果没有 only ，则填 few 表否定， 问题太难以至于没人能解决。

我也选的B，答案是A

the question is so difficult that only --a. a few---students work out it

答案也是有错的时候啊 再或者是因为原句用的so而没有用too所以选a few 但是我认为选few确实更好一点