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请问prep1 的154题

154.
Some patients who do not respond to therapies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.






(A) having, for example, been prescribed a drug at a dosage too low to be effective or having been






(B) having, for example, a drug prescription that was ineffective because the dosage was too low, or being






(C) as, for example, having too low of a dosage of a prescribed drug for it to be effective, or being






(D) when they have, for example, been prescribed too low a drug dosage to be effective, or were






(E) for example, when they have a drug prescription with a dosage too low to be effective, or been







答案是A,但A不是having been done 了吗??
答案的解析说这个have是个实义动词,但我没理解,是实义动词了怎么翻译啊?
请教NN们
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非常感谢,只是我一直认为having been done这种完成进行时用法是错的,所以一看见就把A排除了,这个是完成进行时吗?

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这题考的是or前后时态的对应,你看or后面是having been的前面就也要这样,其他的时态都不对,唯一可能一致的是C,出现了BEING,排除了。

希望能帮到你并祝你取得好成绩!

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