【题目】Only after talking to two students ________ that having strong motivation is one of the biggest factors in reaching goals.
A.I did discover
B.did I discover
C.I discovered
D.discovered I

【答案】B
【解析】句意：只有跟两个学生谈了之后我才发现有很强的动力是达到目的的最大因素之一。Only位于句首强调状语时，主句要用部分倒装，句型为：only+状语+be/助动词/情态动词+主语。故选B。