Niggli first visited Viet Nam in 1999. He has been a generous sponsor of underprivileged Vietnamese children since then.

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.
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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.