39. What is the main reason that Mr. Adams wrote this letter?
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(A) To ask Cindy not to get on the Internet.
(B) To invite Cindy's friends to have dinner at home.
(C) To tell Cindy why he has been so busy these days.
(D) To tell Cindy to be careful about people she meets on the Internet.

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統計： A(3), B(4), C(5), D(35), E(0) #2347074