________ by a crowd of people, he felt nervous, ________ what to say.

A.Watching; didn't know

B.Having watched; and not know

C.Having been watched; not known

D.Being watched; not knowing

答案及解析： D

解析：

导解：此句意为“因为很多人在观看，他感到紧张，不知该说什么”．第一空为现在分词的被动式，表动作的进行；

第二空为现在分词的否定式，表伴随动作．