________ she ran to the classroom, the teacher had begun the class.
A．What timeB．By the timeC．At the timeD．During the time
B               
             
試題分析：考查連詞。句意：到她跑到教室時(shí)，老師已經(jīng)開始講課了。By the time到……為止，到她跑到教室為止，發(fā)生在過去，老師講課發(fā)生在過去的過去，用過去完成時(shí)， 故選B項(xiàng)。          
考點(diǎn) : 考查連詞。              
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