18. (单选题) ______ we now know about the disease was learned by careful study of diseased organs.(本题3.5分) A、 What B、 Why C、 How D、 That

18. (单选题) ______ we now know about the disease was learned by careful study of diseased organs.(本题3.5分)
A、 What
B、 Why
C、 How
D、 That

出自：河套大学-大学英语二

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