21．Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.
a. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are
B. neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are
c. neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past wenty years, and are
d. neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood.
e. neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood.
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发表于 2010-2-6 15:44:22
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