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13．Is this the reason         he gave us for the delay of the project？（　　）
A．howB．whatC．whyD．that

分析 這就是他給我們的推遲這項計劃的理由嗎？

解答 答案：D
題干中he gave us for the delay of the project是修飾reason的一個定語從句；從句中give缺少賓語（give sb sth），要用關系代詞．故選D．

點評 定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導詞分為關系代詞和關系副詞，關系代詞在從句中要作主語或賓語；關系副詞在從句中作狀語．這也是選擇關系詞的一個判斷方法．

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