–Whose advice do you think I should take? –.A. You speakB. That's itC. It's up to youD. Y

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A. You speak
B. That's it
(答案→)C. It's up to you
D. You got it
解析：考查交际用语。”It's up to you“由你决定”，符合题意。句意：——你认为我应该听谁的建议？”——由你决定。故C正确。