I have been going to Shanghai ____ than I used to. A. less B. less than

I have been going to Shanghai ____ than I used to. A. less B. less than
请问哪个正确?帮忙解释一下,谢谢!
B 打错了, 是 less often

a 不至于是b的两个than吧
我现在去上海的次数没有以前多了
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