—Why do you look so puzzled?—Oh,I ________ over a most difficult maths problem.A
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—Why do you look so puzzled? —Oh,I ________ over a most difficult maths problem.A.thought | B.have thought | C.am thinking | D.think |
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答案
C |
解析
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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