W回了 listening in class,you should concertrate____your teacher.A.at B.to C.for D.on 求详解

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W回了 listening in class,you should concertrate____your teacher.A.at B.to C.for D.on 求详解
W回了 listening in class,you should concertrate____your teacher.A.at B.to C.for D.on 求详解

W回了 listening in class,you should concertrate____your teacher.A.at B.to C.for D.on 求详解
D 固定词组