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    【題目】Look! An old lady ________ (carries / is carrying) a big bag on her back.

    【答案】is carrying

    【解析】

    句意:看!一位老太太背著一個大包。look是現(xiàn)在進行時的標志詞,句子動詞部分的結(jié)構為be doing,An old lady是第三人稱單數(shù),be動詞用is,carry-ing形式為carrying,故答案為is carrying。

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