计划生育四项手术内容:望详细分析1 ____ the classroom,.....

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望详细分析1 ____ the classroom,I found him writing a letter.
a Entering b.Entered c.When entered d.Having entered

首先，本题答案应该是A

给你简单解释一下：

对于这类分词做状语的形式，首先要找到句子的主语。由主语和动词（分词）的关系来确定分词的形式。
本句的主语是I，I 对enter这个动作显然主动的，不是被动的，所以B entered不对。
C 同理，如改为When entering...或 When I entered...就对了。
D 这里不强调“我已经进入房间”，句意不符。
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没有省略"when I"之说

b
完整的句子应该是: when I entered the classroom,i found him writing a letter.
when i 可以省略

a Entering 用现在分词做状语表示主动关系.如用entered就表示被动关系了,显然I和enter是主动关系.所以应选a

A 前后主语一致都是 I 所以用独立主格结构也就是说选择分词结构的 CD排除在AB里选有因为主语是人所以选A 若主语是物则选B了

a
when i am entering the classroom.......
应该是走进来看见~~~
做过不少这样的题了

Entering the classroom, I found him writing a letter.
Therefore: A

望详细分析1 ____ the classroom,..... 10. The book is likely to ___(publish) this year.望详细分析 The book is likely to ___(publish) this year.望详细分析 3.The ____ 1 ____ the classroom,I found him writing a letter. Yesterday I ____ ten students ____ ____me what ____ ____ ____ the weekend The sun rises ____...选择题 ____ the world favorite game ? The colour of the gloves ____ red . the book is ____ on the floor