Scientists across the world agree that t
题型：选择题
问题：
Scientists across the world agree that this is an invention of _______ great significance, _______ invention
that will greatly change human life.[ ]
A. a; the
B. a; an
C. / ; the
D. / ; an
Scientists across the world agree that this is an invention of _______ great significance, _______ invention
that will greatly change human life.[ ]
A. a; the
B. a; an
C. / ; the
D. / ; an