Bobs hand began to tremble when he read the note that is from after twenty years because he was shocked.
Bob had be locked up in the jail as he was arrested while going on a visit to his friend.
Only for him to read a letter from his dear friend and noticed his arrest was actually a set up from Jimmy whom he called a friend. This led to a shock that made his hand tremble.
Therefore, Bobs hand began to tremble when he read the note that is from after twenty years because he was shocked.
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