问题补充：
Mary is ill today. If she ill, she absent from school.
A. weren’t; couldn’t be
B. wasn’t; wouldn’t have been
C. wasn’t; wouldn’t be
Dweren’t; won’t be
答案：
(答案→)A. weren’t; couldn’t be
B. wasn’t; wouldn’t have been
C. wasn’t; wouldn’t be
D. weren’t; won’t be
解析：题干的意思是“ Mary今天病了，如果她没生病，今天她就会去上学了”。因为第一句说，Mary今天病了，所以本题考查的是与现在情况相反的事情，因之，主句用would、should、could+动词原形，从句用一般过去时。
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