Mr. Johnson has given up .A. smokeB. smokedC. to smokeD. smoking

问题补充：

Mr. Johnson has given up .

A. smoke

B. smoked

C. to smoke

D. smoking

答案：

A. smoke

B. smoked

C. to smoke

(答案→)D. smoking

解析：句意：约翰逊先生已经戒烟了。Give up 放弃，后接动名词，故选D。