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20.Don't ppretend to have known all.Please raise your questions if any.

分析 不要假装已经全都懂了.如果有疑问请提出来.

解答 答案:pretend.
分析句子的结构可知,本句缺少一个谓语动词,后面需要跟不定式作宾语;结合后面的句子Please raise your questions if any可知,此处是说不要不懂装懂.故答案为pretend.

点评 首字母填空题考查的是词汇的记忆和运用能力,平时要注意积累和运用.同时还要注意提示字母.

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