So uncertain （）about the background of his audience that he didn’t know how to start his lecture.
A.正确答案Dhe would become
B.would he become
C.he had become
D.did he become
So uncertain （）about the background of his audience that he didn’t know how to start his lecture.
So uncertain （）about the background of his audience that he didn’t know how to start his lecture.
A.正确答案Dhe would become
B.would he become
C.he had become
D.did he become
