Daniel_____when he was 7 years old.A.can swim B.could swim C.can swim D.could swam

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Daniel_____whenhewas7yearsold.A.canswimB.couldswimC.canswimD.couldswamDaniel_____whenhewas7yearsold.

Daniel_____when he was 7 years old.A.can swim B.could swim C.can swim D.could swam
Daniel_____when he was 7 years old.A.can swim B.could swim C.can swim D.could swam

Daniel_____when he was 7 years old.A.can swim B.could swim C.can swim D.could swam
B

B
因为when he was 7 years old表示过去的时态,所以用could swim

选b,因为句子中有was,可表明是过去时态,而could后加动词原型大概如此

选b