Tom got sick last May and has been in bed since then.为什么has been 而不是had been

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• Tom got sick last May and has been in bed since then.为什么has been 而不是had been
• My uncle got sick last month and _______ in hospital since then. 空填哪个?A.was B.had been C.has been D.would be
• Tom got sick last May and has been in bed since then.为什么has been 而不是had been
• The old man got sick last April and __in bed since then.A was B had been C has been D would be
• She is still in hospital.she__sick since last Thursday.A.had been B.was C.has been D.have been为什么正确答案是C,不是说现在完成时不能和表示过去时间的状语(last Thursday)连用吗?
• 要积不变性质,也就是乘法中得数不变的性质.
• The old man got sick last April and __in bed since then.A was B had been C has been D would be