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+1. Yes.**From** refers to that which can come forth "I expected a better performance from him on that song" and of refers that which inheres, a state, condition, or quality: "It was expected of us to be prepared for almost anything."
@StoneyB: As you know, things have appeared awkward to me, or even strange, which others have found perfectly acceptable. I think this time that may be happening to you. To me this cleft with the infinitive seems a normal Germanic construction, if a little dated, perhaps; people nowadays tend to say "We were expected to be..." rather than "It was expected of us to be..." The "of us" raises the stakes.