by We/ grateful/ you/ give us a donation
A. We would be very grateful if you could give us a donation.
B. We are very grateful because you can give us a donation.
C. We will be very grateful so you could have given us a donation.
D. So we are very grateful if you will give us a donation.
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Đáp án: A
Giải thích: Chúng tôi sẽ rất biết ơn nếu bạn có thể đóng góp cho chúng tôi.
