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
题目分析：考查动词短语。本题考查动词短语devote … to (doing)…致力于、专心于……，to为介词。句意：王先生下定决心在他出国之前全身心于提高他的口语。根据句意说明D正确。