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
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科目：初中英語 來源：河北省模擬題 題型：單選題

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

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