A burglar broke into the building. At the time, the guard was sleeping. A. When a burglar was breaking into the building, the guard slept. B. Before a burglar broke into the building, the gua

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A burglar broke into the building. At the time, the guard was sleeping.

When a burglar was breaking into the building, the guard slept.

Before a burglar broke into the building, the guard slept.

CA burglar broke into the building as soon as the guard slept.

When a burglar broke into the building, the guard was sleeping.

Giải thích

Đáp án đúng: D

Hành động đang xảy ra trong quá khứ thì hành động khác xen vào: When + S + Ved, S + was/were + V-ing.

Dịch nghĩa: Khi một tên trộm đột nhập vào tòa nhà, người bảo vệ đang ngủ.