1. Disappointed, I was about to leave __________ something occurred, which ________ my attention.

A. while, paid          B. when, attracted      C. before, drew         D. and, got

2. _______ the question many times, Henry lost patience with his slow brother.

A. Having explained           B. Explained     

C. To explain                 D. Having been explained

3. It’s already 10 o’clock. I wonder how it ____________ that she was two hours late on such a short trip.

A. came over      B. came out       C. came about        D. came up