it is not alwasy easy for the public to see what use a New invention can be of to human life

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• It is not always easy for the public to see ______ use a new invention can be of to human life.
• It is not always easy for the public to see _______ use a new invention can be of to human life.
• it was not always easy for the public to see what use a new invention can be of to human life.
• it is not alwasy easy for the public to see what use a New invention can be of to human life
• It is not always easy for the public to see _______ use a new invention can be of to human life.A.what B.that C.how D.which
• it was not always easy for the public to see what use a new invention can be of to human life.怎么翻译?
• it is not alwasy easy for the public to see what use a New invention can be of to human life宾语为什么不选which
• It is not always easy for the public to see ______ use a new invention can be of to human life.A whose B.what C which D.that
• 一个箱子内有10个相同的球,分别标号为1,2,3,……10,从中任取2个球,其号数至多有一个为奇数的概率
• 在Rt△ACB中,∠ACB=90°,BF平分∠ABC,CD⊥AB于D,且和BF交于点G,GE∥CA,试探究CE与FG的关系.