He is ill. He has kept .
A. coughing all along
B. to cough at night
C. cough since yesterday
D. being coughed day and night
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(答案→)A. coughing all along
B. to cough at night
C. cough since yesterday
D. being coughed day and night
解析：考查非谓语动词。Keep doing sth.“一直做某事”，排除B、C；He和cough是主谓关系，排除D。故选A。