The police ____ still not sure ______ the young man killed himself or was killed.
A.is, ifB.is, whether
C.a(chǎn)re , whetherD.a(chǎn)re, that
C

試題分析:if是否,如果;that因?yàn),以至于;whether是否;weather天氣。警方還不確定這個(gè)年輕人是自殺還是他殺。If和whether都能表示是否,但是whether常和or搭配使用,本句中police為集合名詞,表示復(fù)數(shù)含義,故選C。
點(diǎn)評(píng):連詞在句子中主要起聯(lián)系上下文的作用,他們之間的區(qū)別就是表示邏輯關(guān)系的不同,所以在解題時(shí)先要理解上下文含義,然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞。連詞的用法都比較多,語(yǔ)義之間還有交叉,熟記其基本應(yīng)用規(guī)則,了解其區(qū)別,注意固定搭配對(duì)象,是做好此類題型的關(guān)鍵。
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