The assumption that smoking has bad effects on our health have been proved

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Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

The assumption that smoking has bad effects on our health have been proved

that

effects on

have been

proved

Giải thích

Đáp án : D

Chủ ngữ cho mệnh đề này là smoking = việc hút thuốc ~ chủ ngữ số ít; động từ phải chia ở số ít; Sửa D thành has been proved