从选项（1）～（3）中选择最适合填入空格的答案。
Loyal customers are the ones who [ ] a particular brand over time
and intend to do so in the future.
(1) bought
(2) have been bought
(3) have been buying
答案
(3) have been buying
解说
从文意可判断此处要表达从过去某一时刻开始持续到现在，且尚未间断之行为
故答案选择现在完成进行式
其他选项
(1) bought（过去式无法表达现在完成进行式之语感）
(2) have been bought（此处使用被动语态并无实质意义）
下次更新日:9/10
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