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二、单项填空（共15小题；每小题1分，满分15分）
从各题A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. - His mother was ill and he had to look after her in hospital.
- That’s ______ he was absent from the meeting.
A. because B. what C. why D. which
22. We didn’t plan to meet. We met ________ in the street.
A. by the way B. by chance C. on purpose D. in general
从各题A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. - His mother was ill and he had to look after her in hospital.
- That’s ______ he was absent from the meeting.
A. because B. what C. why D. which
22. We didn’t plan to meet. We met ________ in the street.
A. by the way B. by chance C. on purpose D. in general
