I agree that "that" could also be used, but it does alter meaning. Two examples: The thing that mattered was what I learned. The thing that mattered was that I learned.
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LakshwadeepThe thing that mattered was what I learned.
The thing that mattered was that I learned.
The above two sentences are acceptable, but they have different meanings. The first says the speaker thought the learning material was most important. The second says the speaker thought the learning process itself was most important. What you say is true, but i
Stenka25It says the answer is 'what'.I believe that this is a mistake. The answer should have been listed as 'that'.
Stenka25 "All that mattered was what I learned to succeed in the business world."I suppose it's possible, but it seems like kind of a reach. I guess I'll have to go to Google.