—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

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—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
—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

—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
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.

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。