1.考察的语法点是现在分词短语做状语,表原因,时间,方式,伴随情况,结果或条件等,要求分词动作的发出者要与主句主语一致,此题中looking outside the window的主语是I才能使意思通顺,不难排除其他选项.
2.观察四个选项中都是否定副词或副词性短语至于句首,那么将引起句子的部分倒装,显然只有D符合
其他至于句首引起倒装的否定副词：
never,nor,not,little,seldom等
3.这里涉及到被动语态的用法：
我们不知道谁是动作的执行者,或没有必要指出谁是动作的执行者时/当我们对行为对象的兴趣比对象为者的兴趣更大（强调或侧重动作的承受者）时
e.g.He was considered to be a computer genius.他被认为是计算机天才.（没必要说出谁认为）
were believed to be enrolled
enroll意为招生,吸收成员,动作发出者是校方或自学课程的负责人,adults是动作承受者
4.考察虚拟语气中省略if的条件从句的用法
首先判断这是虚拟语气,如果从句的谓语中有should,had,were时,则可省去if,把这些词提到句首,用倒装主谓语序来表达虚拟条件.
如 Were I you,I would get up early every morning.如果我是你,我每天早晨会早起.
还原到省略前：If I were you,————.
此题中还原后为If it had not been for their help,we would not have succeeded.
5.考察would rather虚拟语气
would rather+that引导的从句表示愿望,如果与现在事实相反,则用一般过去时
如Her mother would rather she didn't go to college.她母亲宁愿她没去上大学.
此题中,我宁愿你没被牵扯进这些事里.事实是你现在已被牵扯进来了,另外be involved in牵扯进,卷入
6.通过would have等词判断为虚拟语气,与4题一致
还原为完整句：If she had had time,Denny would certainly have come and help me.
7.Cynthia说她不会参加明天下午的讲座,既然是明天下午,那么参加讲座的动作就还没有发生,发生的动作只有“说”,那么反意疑问部分提问的就是said,是过去时,不用考虑说后面的内容是否存在否定,所以用didn't she
啊,好久没做题再拿起来感觉真不一样...如果还有什么知识点我没讲到,咱们再讨论