The teacher made his students work hard for the exam

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The teacher made his students work hard for the exam.

The students are made work hard by the teacher.

The student was made to work hard by the teacher.

The students are made to work hard by the teacher.

The student was made work hard by the teacher.

Giải thích

Chọn đáp án B

Cấu trúc chuyển đổi câu bị động ở thì quá khứ đơn.
Loại A vì "are made" sai thì, thiếu "to" sau "made"
Loại C vì "are made" sai thì
Loại D vì thiếu "to" sau "made"
Đáp án đúng là B.