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  3. —Could you have been more careful? —Why, what wrong______?

—Could you have been more careful? —Why, what wrong______?

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问题 —Could you have been more careful? —Why, what wrong______?
选项 A、did: do
B、will: do
C、have: done
D、had: done
答案A
解析 语法题。根据前面的问句可知，这是在埋怨对方过去不够仔细，故选A。注意此题不可选D，因过去完成时只能用来表示“过去的过去”运作。请比较以下句子：We began to study English three years ago．我们是三年前开始学英语的。The experiment was done last week．那个实验上周就做过了。The problem had been discussed three weeks before．那个问题是在那时的三周前讨论的。When I came in he had just finished his work．我进来时他刚刚做完工作。Controlled rectifier circuits had been in use long before thyristors were invented．可控整流电路在可控硅发明之前早就采用了。Hardly had I reached the bus stop when the bus started．The teacher had no sooner finished his class than the bell rang．
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