Google
Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
When I___________the book, I'll return it to the library.
A. will finish
B. will have finished
C. finish
D. am finishing
When I___________the book, I'll return it to the library.
A. will finish
B. will have finished
C. finish
D. am finishing
Mệnh đề trạng từ chỉ thời gian: When S + V (hiện tại đơn), S + V (tương tai đơn/be going to + V_infinivite)
Đáp án C.