The birth planning policy allows my parents to have a second child because of my disability, but to look after me, they chose .A.not to doB.not toC.not to haveD.to not have one
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B解析此句考查不定式短语的省略结构，通常情况下不定式中的“to”要保留，其后的不定式短语省略，或者不定式短语用do so 替换，故选项B是正确的。