—How do you think of his teaching method?—It should be popular；it________practical.A．proves B．is provedC．has been proved D．was proved
问题描述：
—How do you think of his teaching method?
—It should be popular；it________practical.
A．proves B．is proved
C．has been proved D．was proved
答
填 C．has been proved
it has been proved practical 的意思是
它（即该教学方法）已被证明实用
It should be popular 应该受欢迎。
答
解析：选A.考查时态和语态.此处的prove是系动词,表示“证明是,表明是”.后三项中的prove都是实义动词,语法结构不太恰当,而且D项的时态不符合语意.