11. Several studies have found that the coronary patients who exercise most actively have half or less than half the chance of dying of a heart attack as those who are sedentary.
(A) have half or less than half the chance of dying of a heart attack as those who are sedentary
(B) have half the chance, or less, of dying of a heart attack than those who are sedentary do
(C) have half the chance that they will die of a heart attack, or less, than those who are sedentary do
(D) are at least fifty percent less likely to die of a heart attack as those who are sedentary
(E) are at least fifty percent less likely than those who are sedentary to die of a heart attack
我觉得这个题的b没有什么问题，为什么选e，我也找不出e的问题。
请指教。。。。
by the way, b is wrong b/c the structure "have half a chance than..." is wrong.
to make it correct:
either "half a chance as..."
or "more (less) than..."
非常感谢，
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