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

答案：登入後查看
統計： A(4), B(16), C(11), D(64), E(0) #359934

詳解 (共 1 筆)

#934905

volunteer后面碰到動词，要用動词的不定式→ to V

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