The little boy____ his pencil everywhere,but he couldn't____
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The little boy____ his pencil everywhere,but he couldn't_____it.
小男孩到处找他的铅笔,但是他找不到它.but表示转折,couldn‘t说明是没有找到,所以前面一空应该是他一直在寻找铅笔,could是can的过去式说明这件事发生在过去,所以整个句子是过去范畴的.寻找的动作在前,找不到是结果(在寻找之后).故用 had looking for(过去完成进行时拜师一直在进行的动作) 、find(情态动词后用动词原形).
希望有所帮助 嘿嘿
希望有所帮助 嘿嘿
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