問題詳情

1. Mr Wang made up his mind to devote all he could ______ his oral English before going abroad.  
(A) improve      
(B) to improve  
(C) improving      
(D) to improving

參考答案

答案:D
難度:非常困難0.195122
統計:A(167),B(87),C(43),D(72),E(0)

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