填空题 (Its hardly ever necessary) to ask a hungry boy (to come to) dinner twice because he (has a hearty) appetite that (gets him to) the table quickly. A. Its hardly ever necessary B. to come to C. has a hearty D. gets him to
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【正确答案】 1、A改为it's hardly ever necessary。    
【答案解析】It 在句中做形式主语，不定式结构是句子的真正主语。