The commission has directed advertisers to restrict the use of the word "natural" to foods that do not contain color or flavor additives, chemical preservatives, or nothing that has been synthesized.
17. The commission has directed advertisers to
restrict the use of the word "natural" to foods that
do not contain color or flavor additives, chemical
preservatives, or nothing that has been synthesized.
(A) or nothing that has been
(B) or that has been
(C) and nothing that is
(D) or anything that has been
(E) and anything
正确答案是D。 or 和 and 的区别我明白。 但是为何要用完成时啊?想不通。 一般现在时或者一般过去时不是更简洁么?而且这也没有synthesized对现在的影响啊
但是如果非要探究这个完成时,也只能按照惯常的规律来理解——相同的时态范畴内,先发生的用完成时。
这句里has directed和do not contain(实际上二者也可能有先后关系,但不须明确)表明,整句时态是现在时范畴。逻辑上,anything是先被synthesized,之后添加入food里,然后food才能contain,所以用完成时没什么问题。