— 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

試題關系：考查情態(tài)動詞和形容詞比較級用法。形容詞的比較級與否定詞連用表示最高級。句意：—你的新的保姆怎么樣？—我們不可能找到一個更好的了。所有的孩子都非常喜歡她。根據(jù)句意說明使用否定詞，排除AB項。C項表示千萬不能，禁止；couldn’t不可能。故D正確。
點評：形容詞的比較級與否定詞連用表示最高級，這一點是考查的重點和�？键c。
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