题目：
多选题
Which of the following is right about Mark Twain’s style of language?
- A. His sentence structures are long, ungrammatical and difficult to read
- B. His style of language had exerted rather deep influence on the contemporary writers.
- C. His words are colloquial, concrete and direct in effect.
- D. His humor is remarkable and characterized by puns, straight-faced exaggeration, repetition and anti-climax.
答案：
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