None of them could understand your meaning, ?A. could theyB. didn’t heC. do theyD. could i

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(答案→)A. could they
B. didn’t he
C. do they
D. could it
解析：本题是反义疑问句，前句表示否定的意思，故后句用肯定的结构，本题用情态动词could，人称为复数，故后半句的结构为could they，故本题选A。