It was Mr Zhang that helped us out of the trouble. Without his help, we it so easily.A. c

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A. can’t manage
B. mustn’t have managed
(答案→)C. couldn’t have managed
D. couldn’t manage
解析：本题考查含蓄虚拟语气。根据It was Mr Zhang that helped us out of the trouble可知是和过去事实相反，Without his help，为含蓄虚拟条件，主句谓语应用couldn’t + have done 结构，所以选C。