we'll go to paris for our holiday...为什么选provided不选so far as
We'llgo to Paris for our holiday,___ it isn't too expensive. A.except B.provided C.so far as D.unless
选B
我每个选项都不是很懂.意思也不清楚特别是c项.大家麻烦帮我讲一下为什么选b
1楼的在讲细一点行吗？c不行吗？
so far as不是也有只要的意思吗？