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一道SAT语法题digging at the site,all power was cut off when the b

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一道SAT语法题
digging at the site,all power was cut off when the backhoe hit an electric cable; fortunately,no one was hurt.(D)
A.as it is now
B.digging at the site,an electric cable was hit by a backhoe,cutting off all power
C.cutting off all power,the backhoe hit an electric cable digging at the site
D.all power was cut off when the backhoe digging at the site his an electric cable.
E.when digging at the site,an electric cable hit by the backhoe cut off all power
为什么选D不选E
这道题的考点在于逻辑主语一致
dig的逻辑主语应该是backhoe,因此可以排除选项A.B.E
C虽然CUT的逻辑主语是backhoe.但hit这个被动语态的过去分词紧跟在backhoe后面,从语法结构上看hit与backhoe构成被动关系,但实际上被hit的是electric cable,因此C也是逻辑主语错误
正确选项只有D