It was very cold so we the fire all the time/A. have.. burntB. had… burnedC. had… burnin

问题补充：

It was very cold, so we the fire all the time/

A. have.. burnt

B. had… burned

C. had… burning

D. have… burning

答案：

A. have.. burnt

B. had… burned

(答案→)C. had… burning

D. have… burning

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