Walkingoutofitwitha

问题详情：

 Walking out of it with a ____ smile on his face, he turned ____ goodbye to his classmates in the classroom.

   A. forcing; to say                     B. forced; to saying         

C. forcing; to saying                   D. forced; to say 

【回答】

D

知识点：非谓语动词

题型：选择题