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6．He tried his best to solve the problem，______difficult it was．（　　）

A．

although

B．

no matter

C．

whatever

D．

however

分析無論有多困難，他都會竭盡所能的解決這個問題．

解答答案：D 題干中difficult是形容詞，要用how來修飾；句意表達的是讓步，要用however來引導，相當于no matter how．故選D．

點評從屬連詞是連詞的一種，用來引導名詞性從句和狀語從句．大致可分為三大類：that（無詞義，不做成分）if，whether （表達是否的意義，但不做句子成分）；連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語、表語、賓語）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語）．學習時，要注意區分和掌握．

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