题目内容
10.Tina ______ play the piano when he ______ four years old.( )| A. | can; am | B. | can; was | C. | could; am | D. | could; was |
分析 当他四岁的时候,蒂娜就能弹钢琴了.
解答 答案:D.考查情态动词.句意"当她四岁的时候,蒂娜就能弹钢琴了.".根据When he…four years old当他…四岁时,可知应该用一般过去时态,he第三人称单数,因此第二个空用be动词单数is的过去式was.第一个空用can的过去式could.答案是D.
点评 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语.要结合语境,选择情态动词的不同用法.
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