第14题: [单项选择]Criticism and self-criticism are necessary ______ they help us to find and correct our mistakes. A. by that B. at that C. on that D. in that 参考答案:D 答案解析:[解析] 空格后为主谓结构的句子,且成分齐全,由各选择项观之,应为介词带宾语从句结构,连词为that,由此判定D项正确。in that为书面语,意为“既然,因为”。由 that引导的介词宾语只能跟in