TOEFL Listening: TPO-TOEFL阅读TPO - I9LR0NKR7YUK9J45N$

According to paragraph 2, Wildman and Niles worried that the teachers they were working with might feel that A. the number of teachers involved in their program was too large B. the concepts of teacher reflection were so abstract that they could not be applied C. the ideas involved in reflection were actually not new and refreshing D. several years would be needed to acquire the habit of reflecting on their teaching