Laura said that when she ____  to school sh...

Câu hỏi: Laura said that when she ____  to school she had seen an accident.

A. was walking

B. has walked

C. had been walking

D. has been walking

Câu hỏi trên thuộc đề trắc nghiệm

Trắc nghiệm Tiếng anh 10 Unit 9: Preserving the environment !!