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Câu hỏi: Mark the letter A, B, C or D 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.