26.27we must do our best to prevent that kind of thing___againa.happeningb.to happenc.happend.happened

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26.27
we must do our best to prevent that kind of thing___again
a.happening
b.to happen
c.happen
d.happened

a
prevent from doing是固定搭配,这里省略from

我觉得选D
that后是一个从句,应有谓语,排除AB
CD我不是特别肯定,凭语感吧

我选D。因为从句意看他指的事情是已经发生过的。而且显然不是考你PREVENT的用法。。那就太简单了。。

支持二楼的,当然选a