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-Why do you look so puzzled?-Oh.I over a most difficult maths problem.A．thoughtB

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-Why do you look so puzzled?-Oh.I over a most difficult maths problem.A．thoughtB

—Why do you look so puzzled?

—Oh，I ________ over a most difficult maths problem.

A．thoughtB．have thought
C．am thinkingD．think

试题答案

C

解析

标签：ohpuzzledmostoverso

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