【題目】Lily is 10 years old now and she ____ swim in the river at the age of 6.

A. can B. could C. must D. need

【答案】B

【解析】

句意：莉莉現(xiàn)在10歲了，6歲時就可以在河里游泳了�？疾榍閼B(tài)動詞。A. can能，會，表示一種能力；B. could 會，能，can的過去式；C. must必須；D. need必需，需要。根據(jù)時間at the age of 6（六歲時）可知此句時態(tài)是一般過去時，結合句意可知填could，選B。

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