Question

________ the classroom, a book was found ________ on the ground.

1. A.
   Entering; lay
2. B.
   Entered; laid
3. C.
   Enter; lying
4. D.
   He entering; lying

Answer 1

D
解析：
当分词的逻辑主语不在句中时，我们要给它加上相应的逻辑主语，也称作独立主格结构。第二空则是现在分词短语在句中作主语补足语。