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1 He has no choice but _to see him

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1 He has no choice but _to see him
A to go B go
2 There was noing they could do but _for a mechanic to arrive
A to wait B wait
语法上讲是 nothing.but 和no +n+but 其后要用不定式
第二提为什么选B呢,答案说有时可省略,什么时候省略呢?)
1 He has no choice but _to see him
很简单,因为有句话叫“前有do,后无to ",只要前面有do,不管是它的过去式也好,还是什么形式,后面的to都省略