There was nothing to do( ) wait until he came back.A.butB.but to可是but前面是to do,根据平行结构,后面也应该是but to wait 为什么选A呢?

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There was nothing to do( ) wait until he came back.A.butB.but to可是but前面是to do,根据平行结构,后面也应该是but to wait 为什么选A呢?
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There was nothing to do( ) wait until he came back.A.butB.but to可是but前面是to do,根据平行结构,后面也应该是but to wait 为什么选A呢?
There was nothing to do( ) wait until he came back.
A.but
B.but to
可是but前面是to do,根据平行结构,后面也应该是but to wait 为什么选A呢?

There was nothing to do( ) wait until he came back.A.butB.but to可是but前面是to do,根据平行结构,后面也应该是but to wait 为什么选A呢?
因为but前是do.如果不是do,就可以 在but后用 to do.