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OG12 SC17 时态问题
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
答案是D没有什么疑问
就是想问如果has been改成is,也可以么?如果不可以,为什么只能用现在完成时?
谢谢啦~ |
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