问题
选择题
John usually relaxes himself by _______ after he finishes his homework.
A．going online
B．played soccer
C．listen to music
D．to watch TV
答案
答案：A
题目分析：句意：John做完作业后经常上网来放松自己。介词by，表示通过某种方式，后面接动词的ing形式，故选A。
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