1. ____ many times, but he still doesn't know how to do it.
A. Having told B. Having been told C. He has been told D. Being told
2. --- Sorry, but I’ll have to keep you waiting for some time.
--- That's all right. I don't mind ____waiting.
A. keeping B. having kept C. having been kept D. being kept
3. --- What do you think made Mary so upset?
--- ____ her bicycle.
A. Losing B. As she lost C. To lost D. Because of losing
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