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题库 / GMATAdvanced-SC-20
One analyst of the liquor industry estimated that this year a few liquor stores have experienced declining sales of up to fifty percent but predicted that the industry as a whole will maintain a volume of sales fairly close to last year.
declining sales of up to fifty percent but predicted that the industry as a whole will maintain a volume of sales fairly close to last year
declines in sales of up to fifty percent but predicted that the industry as a whole would have maintained a volume of sales fairly close to last year
up to fifty percent in declining sales but predicted that the industry as a whole would maintain a volume of sales fairly close to last year’s
sales declines of up to fifty percent but predicted that the industry as a whole would maintain a volume of sales fairly close to last year’s
declines up to fifty percent of sales but predicted that the industry as a whole will have maintained a volume of sales fairly close to last year’s
have experienced 表示动词先时性，experienced 这个动作先于estimated 发生，并且已经产生了结果，即sales declines of up to fifty percent，所以不用have been experiencing简单来说
一个句子同时出现过去时和现在时，可接受
一个句子同时出现现在时和将来时，可接受
一个句子同时出现过去时和将来时，不能接受
栗子
If you go, I will go. 对
If you went, I would go. 对
If you went, I will go. 错
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