Question

________ she ran to the classroom, the teacher had begun the class.

A．What time

B．By the time

C．At the time

D．During the time

Answer 1

B               

             
試題分析：考查連詞。句意：到她跑到教室時，老師已經開始講課了。By the time到……為止，到她跑到教室為止，發生在過去，老師講課發生在過去的過去，用過去完成時， 故選B項。          
考點 : 考查連詞。