再来一道sat语法小问题!其实刚才已经问过了,By using electromagnetic sensors the

再来一道sat语法小问题!
其实刚才已经问过了,
By using electromagnetic sensors the frequency of lighting strikes the United States,meteorologists at the rate of 2000 per hour.
为什么呢?时态原因吗?应怎么改

thyd 1年前已收到3个回答举报

玄蓝昌京种子

共回答了19个问题采纳率：94.7% 举报

是简单的单复数,改后稍稍有指代不明,但是不理啦,看出来就可以了.
第一句的modifier正确,修饰的是气象学家,修饰语中出现了两个均可当为主语的名词,均为复数.选项D里面最佳可理解为闪电频率（也可为电磁感应器,指代不明）,但是D中的"it"指代单数,不能取代复数的"lightning strikeS",所以应该改,变“they”.此句时态无误.

1年前

坚持的小猫幼苗

共回答了1个问题举报

lighting strikes are not compatible with "it occurs"

1年前

烦你又哭幼苗

共回答了5个问题举报

不是吧，是it空指代吧
这个occur应该是说lighting strikes，是复数

1年前

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