(2013·成都七中考前模拟)If you decided to study in America, you have no choice but your English greatly.
A. improves
B. improving
C. to improve
D. improve
网友回答
A. improves
B. improving
(答案→)C. to improve
D. improve
解析：选C 考查非谓语动词作介词but的宾语。句意：如果你打算去美国学习，除了显著提高英语水平外别无选择。but后需跟不定式作宾语，口诀为“前do后不to”。