高二英语选择题目
_____ such heavy pollution already,it may be too late to clean up the river a having suffered b suffering c to suffer d suffered 答案选择a为什么阿 我觉得在这里，后边的it代替的是to clean up the river，那么前边就必须有主语，即it having suffered才对阿？？？我这样分析怎么不对呢
答：我感觉不对啊,做题不能只按常用的搭配来做啊,这题如果选B在语法上,意思上都说的过去,为什么不选呢,难道只是因为不是常用搭配吗?谁说的只能是到上个学期末,不能是从...详情>>
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问：working hard vs. hard working
答：there are no defferent.详情>>
