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White smoke__________25~30 meters above the hill as they approached it.

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White smoke __________25～30 meters above the hill as they approached it.

A． has been seen rise

B． had been seen rising

C． was seen rise

D． was seen rising

参考答案:

D本题考查时态及分词用法。关于时态，主从句时态保持一致，应该用一般过去时；关于分词动词rise，应该用现在分词的一般式(rising)表示正在进行的动作，因此正确答案为D。题干意思：当他们靠近时，发现滚滚白烟已经越过山头25～30米高了。

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