Сложное подлежащее
1) Clyde seemed ... of no one else but Sondra since their last meeting
a. to think
b. to be thinking
c. to have been thinking

2) You appear ... in him something that I have missed
a. to find
b. find
c. to have found

3) She is said ... at school
a. to be working
b. to work
c. to have been working

4) His answers in the court are considered ... of great importance
a. being
b. to be
c. be