Mark the letter A, B, C or D to indicate the sentence that best combines each pair of sentences in the following questions.
Question. Niggli first visited Viet Nam in 1999. He has been a generous sponsor of underprivileged Vietnamese children since then.
A. Before visiting Viet Nam in 1999, Niggli has been a generous sponsor of underprivileged Vietnamese children.
B. Niggli has been a generous sponsor of underprivileged Vietnamese children since his first visit to Viet Nam in 1999.
C. Niggli first visited Viet Nam in 1999 when he has been a generous sponsor of underprivileged Vietnamese children.
D. When he first visited Viet Nam in 1999, Niggli had been a generous sponsor of underprivileged Vietnamese children.
Đáp án B
Dịch: Niggli là nhà tài trợ hào phóng cho trẻ em Việt Nam kém may mắn kể từ lần đầu tiên đến Việt Nam năm 1999.
Dịch: Niggli là nhà tài trợ hào phóng cho trẻ em Việt Nam kém may mắn kể từ lần đầu tiên đến Việt Nam năm 1999.