266、During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.

(A) During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.

(B) During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 to its nadir in 1933.

(C) At the time of the Great Depression, industrial output fell by almost fifty percent from its 1929 peak down to its 1933 nadir.

(D) At the time of the Great Depression, industrial output fell from its peak in 1929, by nearly fifty percent, to it nadir in 1933.

(E) During the Great Depression, industrial output fell from its peak in 1929 to its nadir in 1933 by nearly fifty percent.

B和E的区别在于By介词短语的位置 语法里这种考法似乎还是比较普遍 谁能帮忙解释一下具体该怎么做呀