I know you are very busy. I really appreciate your help, and want to tell you that help has encouraged me to work harder. What may these sentences be excerpted from?
A.
A letter of recommendation
B.
A letter of thanks
C.
A letter of invitation
D.
A letter of asking for help
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举一反三
【单选题】In the passage。which of the following is NOT mentioned as a stage of an oyster's life?