How is your sister?— She ______ quite good after the operation,but sheistaking a turn for the worse today.A.feels B.felt C.had felt D.has been feeling为什么选第二个不选第一个 求详解

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How is your sister?— She ______ quite good after the operation,but sheistaking a turn for the worse today.A.feels B.felt C.had felt D.has been feeling为什么选第二个不选第一个 求详解
How is your sister?— She ______ quite good after the operation,but she
istaking a turn for the worse today.
A.feels B.felt C.had felt D.has been feeling
为什么选第二个不选第一个 求详解

How is your sister?— She ______ quite good after the operation,but sheistaking a turn for the worse today.A.feels B.felt C.had felt D.has been feeling为什么选第二个不选第一个 求详解
表示原来(手术后)感到好,但现在又更糟了.
强调过去与现在的比.
又如:
I thought you were in Beijing.我原以为你在北京.(其实现在在这里)