That very question had troubled him greatly in the past few weeks.

One question had long troubled the few Western travelers to venture up the valley.

Those questions have always been troubling to medical schools.

But questions about their life can still be troubling.

These questions have troubled and fascinated Americans ever since the war took place.

This question had troubled me since I was old enough to think about it.

McCoy had to admit that the same questions were troubling him, as well.

A question troubled him deeply, and he dreaded the answer.

For his heirs and descendants, these questions have been troubling.

The question of how to handle cancer during pregnancy has long troubled the medical profession.