One of the most frequently published and hardworking professors at the law school "were available so frequently to lunch with students that the faculty thought something was"
amiss with his research

"were available so frequently to lunch with students that the faculty thought something
was"

"was available so frequently to lunch with students that the faculty thought something
were"

"was available so frequently to lunch with students that the faculty thought something has gone"

"was available so frequently to lunch with students that the faculty thought something
was"

"was available with great frequency to lunch with students, so the faculty thought of it
as something was"