I spent 30 minutes reading books. I, then, went to bed. A. After I had spent 30 minutes reading books, I went to bed. B. Before I spent 30 minutes reading books, I had gone to bed. C. As so

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I spent 30 minutes reading books. I, then, went to bed.

After I had spent 30 minutes reading books, I went to bed.

Before I spent 30 minutes reading books, I had gone to bed.

As soon as I went to bed, I spent 30 minutes reading books.

While I was reading books for 30 minutes, I went to bed.

Giải thích

Đáp án đúng: A

After + mệnh đề xảy ra trước (quá khứ hoàn thành), mệnh đề xảy ra sau (quá khứ đơn).

Dịch nghĩa: Sau khi dành 30 phút để đọc sách, tôi đi ngủ.