He can’t read much about the subject before giving his speech because he was completely uninformed.
A.Since he knew nothing about the subject, he clearly hadn’t researched it well before speaking.
B.In the end, he didn’t have to give his speech anyway, so he needn’t have read so much about the topic.
C.Not having read much about the subject before his speech, he wasn’t surprised at being considered uninformed.
D.He had to read a lot of about the topic before speaking because he knew nothing at all about it.

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