-How is your new babysitter?
--We _________ ask for a better one. All our kids love her so much.
A．couldn’tB．mightC．mustn’tD．should
A
考查情態(tài)動(dòng)詞。根據(jù)句意“——你們的新保姆怎么樣？——我們不能再要求更好的了，孩子們都很喜歡她�！笨芍�，couldn’t 表示“不可能”，符合句意。should表示“應(yīng)該，應(yīng)當(dāng)”；might表示“可能”；mustn’t表示“禁止，不允許”。
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