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    I was about to leave _____ the telephone rang.

    A. then B. when

    C. that D. and when

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    Cao said it was the first time the dam had to control flood crest since construction of the world's largest dam was completed on May 20 last year．
    The inflow was 50000 cubic metres per second on Tuesday，2500 cubic metres less than Monday's peak．
    It was earlier predicted that inflow would top 56700 cubic metres pr second on Tuesday as more rain was forecast．However，the wind divided the rain clouds on Monday afternoon，said Cao．
    Water levels on the middle and lower reaches of the river were on the rise，said Cheng Haiyun，general engineer of the Yangtze River Hydrological Bureau．
    Hubei Province，where the Three Gorges Project is located，is at risk．The provincial government had given orders to watch over the levees（堤坝） round-the-clock．
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    C：It was the first time the dam had to control flood crest since its completion．
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