Question

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

[　　]

A．Entering; lay

B．Entered; laid

C．Enter; lying

D．He entering; lying

Answer 1

答案：
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。