Having checked the doors were closed, and ___ all the lights were off, the boy
题型：不详难度：来源：
| Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom. |
答案
| B |
解析
| that在此用于引导宾语从句，用作动词check的宾语。句中的现在分词having checked带有两个宾语从句 (that) the doors were closed和that all the lights were off，只是前面一个宾语从句省略了引导词that。 |
举一反三
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