不管有沒(méi)有逗號(hào)都選A,這是現(xiàn)在分詞作狀語(yǔ)：
現(xiàn)在分詞作狀語(yǔ) (表示動(dòng)作發(fā)生的時(shí)間、原因、結(jié)果、條件、讓步、方式或伴隨情況,通常相當(dāng)于一個(gè)狀語(yǔ)從句或并列分句.一般說(shuō)來(lái),這種結(jié)構(gòu)的邏輯主語(yǔ)就是句子的主語(yǔ).)
1.All night long he lay awake,thinking of the problem.
2.The six blind men stood there begging for a meal.
3.Her husband died ten years ago,leaving her with three children to look after.
4.He sat in the armchair,reading a newspaper.
5.Having eaten his dinner,the boy rushed out.
6.Not knowing her address,I can't write to her.
7.Taking the path that leads out of the town,you will come to a lake.
8.Hearing their teacher's voice,the pupils stopped talking at once.
9.Their car was caught in a traffic jam,thus causing the delay.
10.Having lived with the girl for 5 years,we all know her very well.