もし大学時代にCSを学んでいたら難しかったに違いないって英語でなんて言うの?
If I had learned computer science when I was in college, it must have been hard for me to learn it.
これで合っているでしょうか?自然な英語になっていますか?
回答
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If I had studied computer science when I was in college, it would've been difficult for me to learn it.
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If I had studied computer science when I was in college, it would've been difficult for me to understand it.
Hayatoさんの文も正しいと思うのですが、自然さで言えば、must よりも would のほうがよく使われると思います。
参考になれば幸いです!