问题

Entering the reading room, ______
A:Mike and Tom were found seated quietly, doing their homework
B:Mike and Tom were found seating quietly, doing their homework
C:he found Mike and Tom seating quietly, doing their homework
D:he found Mike and Tom seated quietly, doing their homework
B:Mike and Tom were found seating quietly, doing their homework
C:he found Mike and Tom seating quietly, doing their homework
D:he found Mike and Tom seated quietly, doing their homework
正确答案是: