问题
选择题
| 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 |
答案
答案：D
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| 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 |
答案：D