Mary is ill today. If she ______ ill, she _______ absent from school.
A．weren’t; couldn’t beB．wasn’t; wouldn’t have been
C．wasn’t; wouldn’t beD． weren’t; won’t be
A

試題分析：題干的意思是“ Mary今天病了，如果她沒生病，今天她就會去上學了”。因為第一句說，Mary今天病了，所以本題考查的是與現(xiàn)在情況相反的事情，因之，主句用would、should、could+動詞原形，從句用一般過去時。
點評：1、在學習虛擬語氣的時候，要對過去、現(xiàn)在、將來的虛擬的做出正確的判斷。2、一定要記住，虛擬語氣的條件從句的謂語用過去式，動詞be要用were。
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