【題目】I________ sing very well now, but I ________ when I was very young.

A. can; can'tB. can; couldn't

C. could; couldn'tD. can; could

【答案】B

【解析】

句意：我現(xiàn)在唱得很好，但我小的時(shí)候，我不會(huì)唱歌。根據(jù)句子中的“now” 可知，第一個(gè)空是一般現(xiàn)在時(shí)，要用can，排除選項(xiàng)C；根據(jù)句子中的“but但是”可知，第二句是否定的，排除選項(xiàng)D；又根據(jù)“when I was little”可知，要用過去時(shí)，所以答案為B。

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