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英语选择!he had been trying to remove a bottle of milk from the

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/15 15:39:35
英语选择!
he had been trying to remove a bottle of milk from the place ____ he lost hold of the bottle and it fell.
a.before C.when
求a为什么不可以!另外c表示在这时,一般都是was doing when的,哪有had been doing when的啊!
had been trying to表示"当时正在试着",所以用when
before只表示一个时间点,用(过去完成)进行式显然不合适
这里用had been doing而非was doing,是为了强调trying是在lost这个动作之前
仔细体会一下吧:)