By the end of last summer, Alexander _______ his Ph.D.
A. received
B. had received
C. receive
D. are received
Xem đáp án
B là đáp án đúng
Lời giải:
By the end of + mốc quá khứ, QKHT
Công thức nguyên hàm và tích phân
By the end of last summer, Alexander _______ his Ph.D.
A. received
B. had received
C. receive
D. are received
Xem đáp án
B là đáp án đúng
Lời giải:
By the end of + mốc quá khứ, QKHT