15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 12)

They have just set off. They _______ on their way there. can’t be

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They have just set off. They _______ on their way there.

can’t be

must have been

should have been

must be

Giải thích

Đáp án D