John does important research the best ways to help the old.A．findsB．findsC．foundD．to find out 题目和参考答案——青夏教育精英家教网——

题目内容

John does important research _______ the best ways to help the old.

A．finds

B．finds

C．found

D．to find out

D

试题分析：句意：John做了一个重要的调查为了找到帮助老人最好的办法。用不定式表示目的。find out找到，发现。故选D。

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