A _______ number of mothers with young children are stopped from undertaking paid work because they lack access to childcare.A.considerateB.criticalC.fundamentalD.substantial
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D解析考察形容词辨析。Considerate 考虑周到的,体贴的 critical 批评的 fundamental 基本的，substantial实在的，本质的，重要的a substantial number of意为很多人