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(wǎng)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(jié)構(gòu)．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(diào)．
祈使句主語是you，you常省略，但如果要特別強調(diào)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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