— Has Jack finished his homework yet —I have no idea; he ____ it this morning.
（A）was doing
（B）had been doing
（C）has done
（D）did
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更多大学英语单项选择题库试题
- 1— Has Jack finished his homework yet —I have no idea; he ____ it this morning.
- 2He will stop showing off, if no notice ____ of him.–被动语态
- 3The volleyball match will be put off if it ____.
- 4It’s getting cold, Be careful_____ your health.–be careful with
- 5Hearticles for our wall-newspaper these three years, and he about forty articles.
