My friend Max started to play football ______ he was seven years old.
A．sinceB．whenC．ifD．while
B

試題分析：since由于，自從……以來；when考慮到，當(dāng)……時(shí)；if 是否，如果；while然而，當(dāng)……時(shí)。句意：在他七歲的時(shí)候，我的朋友馬克思就開始踢足球了。While引導(dǎo)時(shí)間狀語從句強(qiáng)調(diào)主從動(dòng)作的同時(shí)發(fā)生，從句多用進(jìn)行時(shí)態(tài)，結(jié)合語境可知選B。
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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