The child tiptoed(翘起脚尖走) quietly to the bird. ______ into the forest when he was about to catch it.

A. It was we being late
B. It was our being late
C. It was we were too late
D. It was because we were late

A. only a doctor did they see
B. only a doctor saw they
C. only a doctor they saw
D. only a doctor had they seen