问题
选择题
Before going abroad he devoted all he could _______ his oral English.
A．improve
B．to improve
C．improving
D．to improving
答案
答案：D
本题考查非谓语动词。句中考查短语devote … to …专心于。句意：出国之前，他尽他所能专心于他的口语。
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