A good teacher must be able to hold his students’ attention ____ he reaches the end of the class.
A．whenB．a(chǎn)fterC．untilD．unless
C

試題分析：考查連詞辨析。A當(dāng)…時(shí)；B在…后；C直到…才；D除非；句意：好的老師一定能夠吸引教師的注意力，直到這節(jié)課結(jié)束。本句中前面句子的謂語(yǔ)動(dòng)詞hold his students’ attention是一個(gè)延續(xù)性動(dòng)詞，如果是短暫性動(dòng)詞，則使用not…until…；故C正確。
點(diǎn)評(píng)：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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