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

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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

6.He has no alternative but _____to ask his sister for help. has,he,help,to,his,with,sister,her,math It is_______that he has to ask for help. He kept ( )to his old friends to ask for help. I wonder if he （）ask his brother for help. Hello!I _____to ask you for help again . entirely _____to the study of wild life ,he has no time for have no alternative but to i'm afraid i have no alternative but to ask you to leave. He has no brother and no sister. He has no time to do it.You can ask _____ to help. A touris has lost his cases and asks you for help.Ask him ab