观察下列句子.试着归纳其画线部分所包含的句型结构. The two of them are sailing down the Mississippi River on a raft when they see something in the water ahead of them- 题目和参考答案——青夏教育精英家教网—

题目内容

观察下列句子，试着归纳其画线部分所包含的句型结构。

The two of them are sailing down the Mississippi River on a raft when they see something in the water ahead of them…

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答案：
解析：

be doing sth…when…(when引导的从句表示突然或者意外发生的情况)

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