In “The Mystery of the Silver Box”, what worries Mr. Grayson and costs him millions of dollars is____

In “The Mystery of the Silver Box”, what worries Mr. Grayson and costs him millions of dollars is_____ at his office.

In “The Mystery of the Silver Box”, what worries Mr. Grayson and costs him millions of dollars is_____ at his office.
【正确答案】：a telephone connection

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