Two years ago, she bought an expensive mountain bike and then she persuaded me to buy .
A. this
B. that
C. it
D. one
网友回答
A. this
B. that
C. it
(答案→)D. one
解析：句意：两年前她买了一辆昂贵的山地车，现在她说服我也买一个。这里需要一个代词指代an expensive mountain bike，可以用one泛指前面的可数名词，this“这个”表示近指，that特指可数名词的单数或不可数名词，it是指同类同物，所以选D。