問題詳情

(  )7.Sammy is a nice girl. She often volunteers ________ her classmates mop the floor.
(A) help 
(B) helps 
(C) helping 
(D) to help

參考答案

答案:D
難度:適中0.641026
統計:A(4),B(12),C(8),D(50),E(0)

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