Mr. Wang made up his mind to devote all he could _____ his oral English before going abroad._刷题宝

题干

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

上一题下一题 0.0难度选择题更新时间:2017-02-19 03:48:18

答案(点此获取答案解析）

D

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