Charles did what he could the servant, although he himself was in danger.?A．rescueB．rescuedC．to rescueD．rescuing 题目和参考答案——青夏教育精英家教网—

题目内容

Charles did what he could _____ the servant, although he himself was in danger.?

A．rescue

B．rescued

C．to rescue

D．rescuing

此题中could后省略了do,而不定式to rescue是目的状语。

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