is no need A. It; complainingB. That; complaining C. There; to complainD. This; to complai

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A. It; plaining
B. That; plaining
(答案→)C. There; to plain
D. This; to plain
解析：考查固定句式。固定句式：There is no need to do sth没有必要做某事；句意：没有必要抱怨。故C正确。