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How can you sit there calmly eating muffins when we are in this horrible trouble i cant make out you seen to me to be perfectly heartless who said this quote

Why does pumblechook choke on the brandy at christmas dinner? a. he has had too much to drink. b. mrs. joe had only spoiled brandy to serve him. c. pip replaced it with tar water. d. he becomes overexcited telling his story.

The significant structural shift that happens between chapters 21 and 22 is