My son wants a pet rabbit for long, but I have no time to buy for him.
A. one
B. that
C. the one
D. it
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(答案→)A. one
B. that
C. the one
D. it
解析：考察代词辨析。One 指代可数名词单数，表示泛指；其特质形式为the one。It指代上文出现的同一事物；that指代可数名词单数，或者不可数名词，后面必须有定语修饰。起复数形式为those，同样后面也应该有定语修饰。本题中的one指代上文出现的可数名词单数a pet rabbit。故A正确。