1. You can replace to do with to be done, giving approximately the same sense. 2.
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The answer is B. Why not C? Because"there" should not be there.inside its walls lived the queen
William PeiCan we replace “to do” here with “to be done”, that is, “With so much work to be done, we can’t play outside any longer.”?Yes. One is the active form of the infinitive, the other is the passive.
William Pei2. The place was heavily guarded, because inside its walls __________.A.where lived the queen B. lived the queen