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

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

Tom got sick last May and has been in bed since then.为什么has been 而不是had been
从那时起到现在,而不是在那时之前.