___ we know some basic knowledge concerning AIDS, we can protect ourselves from being infected.


  1. A.
    If only
  2. B.
    Even if
  3. C.
    So long as
  4. D.
    Unless
C
詞義辨析，四個(gè)選項(xiàng)分別表示只要、即使雖然，只要和除非。從語氣上看，only if 的語氣要比as long as 強(qiáng)，as long as 通常只是用于提出一個(gè)條件，與if 的意思比較接近；而only if 引出的從句內(nèi)容則通常暗示它是主句內(nèi)容的唯一條件，含有“只有……才……”“只有在……的時(shí)候”“……唯一的條件是……”之意用法上的區(qū)別在許多情況下，as long as 與 only if 均可用，只是語氣有強(qiáng)弱之分。但是，當(dāng)主句和從句的謂語動(dòng)詞均為短暫性動(dòng)詞時(shí)，通常只用 only if，而不用 as long as。詞序上的差別兩者均可引導(dǎo)從句置于主句之后，也可置于主句之前。但是，當(dāng)only if 引導(dǎo)的狀語從句置于主句之前時(shí)，其后的主句要用倒裝語序，而且 as long as 引導(dǎo)的從句置于主句之前不用倒裝。根據(jù)題意選C。只要我們知道一些關(guān)于艾滋病的基本知識(shí)，我們就能保護(hù)我們不受感染。
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