单项选择题

He was studying hard so that he could have a good command of English.

A．他学习刻苦，这样就可以用英语发布命令了。
B．他学习刻苦，结果他已经可以熟练掌握英语了。
C．他正在刻苦学习，将来他可以学好英语。
D．他那时正为学好英语而努力学习。

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