6.He has no alternative but _____to ask his sister for help.

问题描述:

6.He has no alternative but _____to ask his sister for help.
A.to go B.go
C.going D.goes
该选哪个?说明为什么

A
在含介词but的句型中,but前有do,则but后的不定式不能带to;相反,but前若找不到do,则but后的不定式必定带to.例如:
I have no choice but to accept the fact.我别无选择,只好接受这个事实.
alternative 同choice