Australians use English as their mother tongue so they are native speakers.

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Australians are native speaker although they use English as their mother tongue.

Australians are native speaker because they use English as their mother tongue.

Australians are native speaker though they use English as their mother tongue.

Australians are native speaker owing to they use English as their mother tongue.

Giải thích

Đáp án đúng là: B

Because + mệnh đề: bởi vì

Dịch: Người Úc nói tiếng Anh như tiếng mẹ đẻ nên họ là người bản xứ.