求助一题填空

Although in his new book he tends to repeat himself like a _____ uncle, McHughen makes a persuasive case for the safety of tinkering with genes to create new foods. A. taciturn B. reserved C. prototypical D. cantankerous E. loquacious F. garrulous 请赐教啊，我选的是AB，答案给的是EF，因为当时看到最后是做新食物，所以选了AB