Who was it ______ saved the drowning girl
A. since
B. as
C. that
D. he
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-- Are you a teacher -- I______, but now I am working in a company.
A. is
B. am
C. was
D. had
If only we ______ then, the disease was curable.
A. knew
B. could know
C. had known
D. would have known
4,你和同事合作领导演讲稿,集体会议时有人指出有一部分是抄袭的,你发现是你同事负责的部分,你怎么办