问题描述：
这句话属于独立主格结构吗?
Four days after setting out,while the Titanic was sailing across the icy water of the North Atlantic,huge iceberg was suddenly spotted by a lookout.
要是属于独立主格结构.为什么主句和分句中都有was
Four days after setting out,while the Titanic was sailing across the icy water of the North Atlantic,huge iceberg was suddenly spotted by a lookout.
要是属于独立主格结构.为什么主句和分句中都有was
问题解答：
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