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From mum's love,patience and understanding,I have learned what a huge responsibility---is to raise a child.A.it B.that C.this D.one请...全文
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teacherlucas111：选it，it 是形式主语，原句是to raise a child is a huge responsibility，再变成 what a huge responsibility it is to raise a child!是感叹句 。(2011-04-18 22:44)
