There was nothing they could do ______.

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问题 There was nothing they could do ______.

选项 A、but wait
B、except waiting
C、only to wait
D、unless they waited

答案A

解析 省略to的动词不定式。but前面是动词do时,后面出现的动词用不带to的动词不定式。[例句] She can’t do anything but cry.她除了哭,什么也不会做。
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