The flowers sweet in the botanic garden attract the visitors to the beauty of nature.
A. smelling
B. smelt
C. to smell
D. to be smelt
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(答案→)A. smelling
B. smelt
C. to smell
D. to be smelt
解析：句意：植物园里的这些花闻起来非常甜吸引了参观者来欣赏大自然的美。这里整个句子有动词attract，所以空格处需用非谓语动词，这里smell是系动词没有被动，故选A。