Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
A．whyB．that
C．whenD．ours
B
that在此用于引導(dǎo)賓語(yǔ)從句，用作動(dòng)詞check的賓語(yǔ)。句中的現(xiàn)在分詞having checked帶有兩個(gè)賓語(yǔ)從句 (that) the doors were closed和that all the lights were off，只是前面一個(gè)賓語(yǔ)從句省略了引導(dǎo)詞that。
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