问题
选择题
Tom is expecting a pet for long, but his daddy has no time to buy _________ for him.
A．it
B．one
C．this
D．that
答案
答案：B
one 代替上文提到的事物中不确定的一个，故选B
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Tom is expecting a pet for long, but his daddy has no time to buy _________ for him.
A．it
B．one
C．this
D．that
答案：B
one 代替上文提到的事物中不确定的一个，故选B