问题
Entering the reading room, ______.
A:climbing
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：
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