But at last many Chinese people helped them----处应加什么?a.find b.finding c.looking for

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But at last many Chinese people helped them----处应加什么?a.find b.finding c.looking for
But at last many Chinese people helped them
----处应加什么?a.find b.finding c.looking for 

But at last many Chinese people helped them----处应加什么?a.find b.finding c.looking for
答案是 find.语感告诉我,完整的句子是:
But at last many Chinese people helped them FIND the missing pilot.

加 A
句子应当是 but at last many (find) Chinese people helped them.
但是最后,许多人发现,中国人帮助了他们。
三个选项中只有A可以做谓语。