问题
Mary is ill today. If she _____, she _____ absent from school. [ ]
A: were not ill; wouldn't be
B: had been ill; wouldn't have been
C: had been ill; should have been
D: hadn't been ill; could be
B: had been ill; wouldn't have been
C: had been ill; should have been
D: hadn't been ill; could be
正确答案是：
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