433, sec21-14
A,B都没有谓语的.shortens是从句的谓语.
C有三个错误,首先that指代不清,前面有两个单数名词,requirement和minimum;其次罗索, rather than前后要有平行的内容就行, 这里fourteen清楚的表明是fourteen days, 前面的a minimum of 用that of代替显得多余, 可省;
D. from... to... 的顺序是不能改的(这个观点不敢肯定,说尽量不改比较好)。7d minimum不知道能不能这样用,即使能,也应该是from 14d minimum to 7d minimum. 这里to a seven-day minimum from fourteen省略了minimum, 这样省略依据似乎不足, 意思表达不完整。实际至少要表达的意思是from a fourteen-day minimum to a seven-day minimum.
E. best.
lessen减少[intransitive and transitive]synonym reduce
to become smaller in size, importance, or value, or make something do this
lessen the risk/chance/possibility etc (of something) Exercise lessens the risk of heart disease. lessen the impact/effect/importance (of something) The new project will lessen the effects of car pollution.Gradually her anxiety lessened.
shorten缩短[intransitive and transitive] opposite lengthen
to become shorter or make something shorter
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