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问题: 英语选择题

1、When first ____ to the European market, this Chinese product was popular with people.

A introducting B introduced C introduce D being introduced

答案是:B 请解释

2、Whatever happens, you should keep on what you ____ until you're completely successful.

A start B have started C had started D started

答案是:B 请说明理由

解答:

1. when +P.P
主句主语和动词之间是被动关系,用过去分词

中国产品 和引进之间
2.
考察时态.
整个句子用的是现在的时态
所以不能用C had started D started
其次从句意来看,意思就是不管发生什么,你应该继续你已经开始的事情知道你完全成功。那么这件事情是不是已经开始了呢
当然是开始了,用现在完成时态,不是一般现在时态




参考文献:个人观点