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6．______again later if the webpage you are looking for is temporarily unavailable．（　�。�
A．TryB．To tryC．Having triedD．Trying

分析 如果你瀏覽的網頁暫時鏈接不上，等會再試試．

解答 答案：A．
祈使句，表示命令，請求．不用主語，直接用動詞開頭．you are looking for是后置定語，修飾 the webpage，翻譯的時候要放到前面去．這個句子是主系表結構．is是系動詞．故選A．

點評 祈使句是用來表示命令、請求、建議、號召等的句子，謂語動詞用原形，句末用感嘆號"！"或句號"．"．朗讀時一般用降調．
祈使句主語是you，you常省略，但如果要特別強調對方或表達某種強烈的情緒時可以有主語或稱呼語．
Be quiet．請安靜．
You be quiet！你給我安靜點！

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