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--- How’s your new babysitter?
--- We ______ ask for a better one. All our kids love her so much.
A.should B.might C.mustn’t D.couldn’t
D

试题分析:否定词+比较级意思为“不能再...了”,即表示最高级“非常...”或“最...”的意思。
该结构多为“can't /couldn't +比较级”的形式。例如: 1)I can't agree with you more.我再同意你不过了。故选D,句意,——你的新保姆怎么样?——我们不能找到比她更好的了。我们所有的小孩都如此爱她。
点评:要掌握该结构的用法,须注意以下几点: 1.该结构多为“can't /couldn't +比较级”的形式。用于该结构中的否定词除了not之外,还有no, never,nothing等。
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