Who wrote the report on the air pollution A. By whom was the report on the air pollution

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Who wrote the report on the air pollution?

By whom was the report on the air pollution written?

Whom was the report written on the air pollution by?

By whom was the reportwritten on the air pollution written?

No answer is correct.

Giải thích

Đáp án: A

Giải thích:

- Giới từ phải theo sau luôn Whom trong mệnh đề quan hệ.

- Báo cáo viết về ô nhiễm môi trường => the report written vs on the air pollution phải viết liền nhau

Dịch: Báo cáo viết về ô nhiễm không khí được viết bởi ai?