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They had to postpone the meeting because of illness

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They had to postpone the meeting because of illness.

The meeting because of illness had to be postponed.

The meeting had to be postponed because of illness.

The meeting had to because of illness be postponed.

The meeting had to be postponed by them because of illness.

Giải thích

Chọn đáp án B

Giải thích : câu bị động với động từ khuyết thiếu have to V => have to be PII