—Why do you look so puzzled?

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

Athought Bhave thought

Cam thinking Dthink

 

C

【解析】考查時(shí)態(tài)。句意:——為什么你看上去這么困惑?——哦,我正在思考一道數(shù)學(xué)難題。根據(jù)問話者說的“l(fā)ook so puzzled”可知,思考難題這一動(dòng)作正在進(jìn)行當(dāng)中,故選C

 

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