1 . Not only ________my skills of communication but also ________me to know more about our traditional culture.
| A．the activity trained; it allowed | B．did the activity train; did it allow |
| C．did the activity train; it allowed | D．the activity trained; did it allow |
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2 . Only when________the door of the house________that he had left the key in the office.
| A．did he arrive at; did he realize | B．he arrived at; did he realize |
| C．did he arrive at; he realized | D．he arrived at; he realized |
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