My mother told me she _______ very tired since she came back from a visit to our grandparents.

My mother told me she _______ very tired since she came back from a visit to our grandparents.

A. was

B. had been

C. is

D. has been
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Đáp án: B
Giải thích: HTHT since QKD, câu gián tiếp.
Dịch: Mẹ tôi kể với tôi rằng bà đã rất mệt kể từ khi trở về từ nhà ông bà.