推 sellgd:"was believed" believe 受 to V 很常見的用法 05/20 03:23
It is common for old people to experience memory loss. In the past,
age-related memory impairment was belive _______________ with total
numbers of brain cells. Neuroscientists offered a theory that the brain
contained a finite number of brain cells, and as we grew old, the available
cells were used up.
(A) to have been associated
(C) being associated
答案是A，為何不能選C?
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