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    精英家教网 > 高中英语 > 题目详情
    —Why do you look so puzzled?
    —Oh，I ________ over a most difficult maths problem.
    A．thoughtB．have thought
    C．am thinkingD．think
    C
    考查时态。句意：——为什么你看上去这么困惑？——哦，我正在思考一道数学难题。根据问话者说的“look so puzzled”可知，“思考难题”这一动作正在进行当中，故选C。
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