问题
选择题
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
答案
答案：A
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。
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