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Tom was ill for a long time.Now his grades____

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Tom was ill for a long time.Now his grades____
A.dropped B drops C have dropped D are dropped
Tom was ill for a long time.Now his grades____
C have dropped



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再问: 为什么AD不对
再答: .Now 这个状语实际上就把A排除了。
成绩下降了,指的是现在的情况,而非动作,所以不用被动语态,排除D