Upon doing 引导的句子

Upon doing 引导的句子
这个句子是这样的
Upon learning that Alishon couldn't afford to return to college this semester, her friend _____(make) an effort to help her pay for tuition.
我觉得是这样的...如果这是upon learning 引导的条件状语从句...那么主句和从句的时态不是应该不一样吗..但是这题的答案是make 所以.为什么呢..