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I ________ work out the problem at first...

I ________ work out the problem at first, but after my teacher showed me an example, I ________ get the answer easily.

A.couldn’t; was able to                   B.can’t; could

C.wasn’t able to; could                   D.was able to; was able to

 

A 【解析】 试题分析:句意:起初我不能做出那个问题,但是在老师给我做了例子后,我就很容易地得到了答案。can作情态动词的基本意思是“能,能够”“可以”“可能,会”,可表示体力、智力能够完成一件事情或环境赋予的能力; 也可表示由于环境或其他因素而产生的可能性,只有现在时和过去时两种形式,,它可表示不一定能够做完一件事;而be able to则有多种时态形式。有能力做,并且做完了事情。故选A。 考点:考查情态动词的用法。
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