Which of the following can NOT be used as subject?A. Mary B. walking along the streetC. th

问题补充：

Which of the following can NOT be used as subject?

A. Mary

B. walking along the street

C. they

D. feed the animals

答案：

A. Mary

B. walking along the street

C. they

(答案→)D. feed the animals

解析：一般作为主题时，要用名词，代词或相当于名词的词来修饰，而ABC都是相当于名词的词，或代词，故选答案为D，D为动词词组。