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提问:13359003484
级别:三年级
来自:安徽省滁州市定远县

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已解决的问题 Only if the red light comes on any danger t
Only if the red light comes on any danger to employees.
A. there is B. there was C. is there D. was there
 提问时间:2009-12-11 18:38:18    评论举报
最佳答案此答案已被选择为最佳答案,但并不代表问吧支持或赞同其观点
回答:冬凌草
级别:一级教员


2009-12-11 21:04:41
来自:河南省平顶山市
Only if the red light comes on _____ any danger to employees.
A. there is B. there was C. is there D. was there
【答案】C 
【简析】only if“只有”,常用在句首,主句要用倒装句,根据从句的时态可知选C。
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