虚拟语气,一般时无论主语是单数还是复数,谓语都是WERE,过去时是HAD DONE（过去完成时）.
他看起来好像是病了很久.
看起来像并不是真实的,所以是虚拟语气
看看这个吧
（英语）关于时态He looked as if he _____________ ill for a long time
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