as a new recruit on the st. louis police force, henry encountered little more danger than expected in his line of work.

신입사원으로서, 그는 자기가 예상했던 것 보다 더 많은 위험에 직면했다.

he encountered little more danger than it was expected by him in his line------. 다시 영작하면 이런 것 같은데요.

was to be / has been / were to be / have been

1번이 답이라는 군요. 주어를 빼고 쓴 건지... than 뒤에서 주어 지울 수 있는 법칙이 있는 것인지. 설명부탁드립니다.