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should be avoided となぜ動詞が2つ並ぶのですか? → なぜなら、[be avoided]は受動態だからです。
Universities are too expensive for many people, and student loans(S) should be avoided(V). <受動態>
Universities are too expensive for many people, and they(S=many people) should avoid(V) student loans(O). <能動態>
参考にしてください。
You're welcome!😊