When the bell rang the students were all sitting on their own seats quietly and looking f

问题补充：

When the bell rang, the students were all sitting on their own seats quietly and looking forward to their new Chinese teacher.

A. have seen

B. be seen

C. see

D. seeing

答案：

A. have seen

B. be seen

C. see

(答案→)D. seeing

解析：考查短语的用法。look forward to 期盼，期待，to 为介词，后接n/doing ,考点：考查短语的用法。