When (27)_______ visual signals are not possible, more formal signals may be needed.
A. their
B. These
C. This
D. That
Đáp án đúng là: B
Giải thích: signals là danh từ đếm được số nhiều, hơn nữa lại không có chủ thể sở hữu nào được đề cập đến nên không thể sử dụng their.
Dịch: Khi những tín hiệu thị giác này không khả thi, nhiều tín hiệu lịch sự khác có thể được cần đến.
Mark the letter A, B, C or D to indicate the correct response to each of the following exchanges
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Which of the following should be the title of the reading passage?