用定语从句合并成一句话 These are connected to thick wires.The thick wires are buried under thestreet.

问题描述:

用定语从句合并成一句话 These are connected to thick wires.The thick wires are buried under the
street.

These are connected to thick wires 【which/that】 are buried under the street.
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These are connected to thick wires that are buried under the street.