________________, they couldn’t make their teacher change her mind.
A．Whatever hard they try
B．No matter how they tried hard
C．As they tried hard
D．Hard as they tried
答案：D
试题分析：考查形式倒装。句意：尽管他们努力了，但是他们还是没有让老师改变想法。本句中的Hard as they tried=" Though" they tried hard，这是一个形式倒装。应该使用how对副词hard进行修饰，排除A项，B项中应该把hard提前到how的后面。C项的语义不正确。故D正确。 考点：考查形式倒装