Jack was in low spirits those days and his friends did all t

Jack was in low spirits those days and his friends did all they could ______him up.
A.cheer B.cheering C.cheered D.to cheer
不是前面有个could 不就应该要用动词原形吗?为什么是选D?

rainbow_yeung 1年前已收到1个回答举报

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我们来看后半句His friends did （all they could） ______him up.
我打了个括号你就明白了.这里all they could中they could是个简短的定语从句用来修饰all,而all they could整体是did的宾语,整句话相当于do sth to do……,两个动词之间用不定式to.
所以这道题选D.

1年前

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