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

分析 不要假裝已經(jīng)全都懂了．如果有疑問請?zhí)岢鰜恚?/p>

解答 答案：pretend．
分析句子的結(jié)構(gòu)可知，本句缺少一個謂語動詞，后面需要跟不定式作賓語；結(jié)合后面的句子Please raise your questions if any可知，此處是說不要不懂裝懂．故答案為pretend．

點評 首字母填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．同時還要注意提示字母．

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