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

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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.

Before visiting Viet Nam in 1999, Niggli has been a generous sponsor of underprivileged Vietnamese children.

Niggli has been a generous sponsor of underprivileged Vietnamese children since his first visit to Viet Nam in 1999.

Niggli first visited Viet Nam in 1999 when he has been a generous sponsor of underprivileged Vietnamese children.

When he first visited Viet Nam in 1999, Niggli had been a generous sponsor of underprivileged Vietnamese children.

Giải thích

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.