---Mr. Smith must know a lot about Chinese history.   
---________. He has studied it for years.
A．So he doesB．So does heC．So he mustD．Yes, he must
A

So somebody do的意思是“的卻如此”，一般表示贊同某人某事；而So do somebody的意思是“誰誰誰也是這樣的”，一般表示和某人、某事的情況一樣；So he must 的意思是“因此他必須怎樣怎樣”，一般表示某人不得已必須要干某事；Yes，he must的意思是“是的，他必須這么做”，一般用再贊同某人的看法上。
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