作业帮If he ___ to the teacher attentively,he ___ the answer to th
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If he ___ to the teacher attentively,he ___ the answer to the problem now.
A.had listened,would have known B.listened,would know
C.listened,would have known D.had listened,would know
A.had listened,would have known B.listened,would know
C.listened,would have known D.had listened,would know
If he ___ to the teacher attentively,he ___ the answer to the problem now
D.had listened,would know
这道题目是考查虚拟语气中的交叉虚拟问题.
即,当虚拟条件句中,主句和从句的时间是不一致的时候,应分别考虑不同时间下的虚拟状况.
按照本句的实际情况,listen发生的时间应在过去,那么对于过去时间的虚拟采用过去完成时,had listened ;而know the answer 发生在现在,那么对现在时间的虚拟采用would +动词原形,也就是would know
D.had listened,would know
这道题目是考查虚拟语气中的交叉虚拟问题.
即,当虚拟条件句中,主句和从句的时间是不一致的时候,应分别考虑不同时间下的虚拟状况.
按照本句的实际情况,listen发生的时间应在过去,那么对于过去时间的虚拟采用过去完成时,had listened ;而know the answer 发生在现在,那么对现在时间的虚拟采用would +动词原形,也就是would know
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