885-s2-23 大全278

Europeans have long known that eating quail sometimes makes the eater ill, but only recently has it been established that the illness is caused by a toxin present in the quail’s body only under certain conditions.fficeffice" />

(A) Europeans have long known that eating quail sometimes makes

(B) Europeans have long known quail eating is sometimes able to make

(C) Eating quail has long been known to Europeans to sometimes make

(D) It has long been known to Europeans that quail eating will sometimes make（A）

(E) It has long been known to Europeans that quail, when it is eaten, has sometimes made

怎么搞的，今晚问的3题答案都是a,我都选d, d是不是quail eating 不好？但我觉得 it has long been known to sb 比a的结构好啊？

有没有大侠在给偶解释一下这题？a 和d如何比高低？

will make in D is inappropriate to describe a condition that holds true in the present as well as in the future or the past.