He talked about the classmates and the school （ ） he had visited.
（A）who
（B）that
（C）which
（D）about which
（ ） is often the case with children, Amy has been better by the time the doctor arrived.
（A）What
（B）As
（C）That
（D）It
The place （ ） interested me most was the amusement park.
（A）which
（B）where
（C）what
（D）in which
