sweet the flowers in the botanic garden attract the visitor.A. SmeltB. To smellC. To be

问题补充：

sweet, the flowers in the botanic garden attract the visitor.

A. Smelt

B. To smell

C. To be smelt

D. Smelling

答案：

A. Smelt

B. To smell

C. To be smelt

(答案→)D. Smelling

解析：考查非谓语动词。句中逻辑主语为the flowers，与smell之间的关系为主语关系，故用现在分词。故选D。