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【题目】Please turn off the radio! I __________over some difficult maths problems.

A. thinkB. have thoughtC. am thinkingD. will think

【答案】C

【解析】

句意:请关掉收音机!我正在想一些难的数学题。考查时态。A. think一般现在时;B. have thought现在完成时;C. am thinking现在进行时;D. will think一般将来时。根据句意请求别人关了收音机,所以应是现在需要思考问题。故选C

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