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问题: The old man runs very fast as if he----a young man

A. is B. was C. were D. should be

解答:

C
这是虚拟语气
old man 已经老了,这是事实,但是句子说他似乎很年轻,年轻与他的现状不符合,所以用虚拟语气.在虚拟语气中,be动词都要用were替代!!