1.Before taking measures to solve the problem,it is necessary for us to know     the problem itself is.( 。
A.whatB.thatC.whichD.why

分析 在采取措施解決問題之前,了解問題本身是什么對于我們來說是很有必要的.

解答 答案:A.
在本句中know后面的成分為一個(gè)賓語從句,從句中is后面缺少一個(gè)表語,所以用what來引導(dǎo),what在引導(dǎo)賓語從句時(shí)是可以充當(dāng)一定成分的,that引導(dǎo)名詞性從句時(shí)不作成分,which引導(dǎo)賓語從句時(shí)多強(qiáng)調(diào)范圍,why引導(dǎo)賓語從句時(shí)多作狀語,均可排除;故選A.take measures to do sth意為采取措施做某事,it為形式主語,后面的不定式作真正主語.

點(diǎn)評 對于賓語從句的引導(dǎo)詞要分清他們的作用和在從句中是否充當(dāng)成分,充當(dāng)何成分等.

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