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Jackwasinlowspiritsthosedaysandhisfriendsdidalltheycouldhimup.A.cheerB.cheeringC.cheeredD.tocheer不是前面有个could不就应该要用动词原形吗?为什么是选D?

题目详情
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?
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答案和解析
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 d...