问题补充：
Mr.Feng put ZhaoMingthe study group.
A. in charge of
B. in need of
C. in the charge of
D. responsible
答案：
(答案→)A. in charge of
B. in need of
C. in the charge of
D. responsible
解析：考查介词短语：A. in charge of负责 B. in need of需要C. in the charge of被…负责D. responsible有责任的，句意：冯先生让赵明负责学习小组。选A。
