. I'd really appreciate if you would turn off the lights before you leave.
A. you
B. that
C. as
D. it
网友回答
A. you
B. that
C. as
(答案→)D. it
解析：
试题分析: it 的用法。句意；如果你在离开之前会把灯关掉，我将不甚感激。appreciate,like,love,hate等表喜好，憎恨之类词后不能直接接从句，必须先补充it后再接从句。it表虚指，无实义。另外，一些动词短语也不能直接加从句，必须加it再接从句,如see to it that ,depend on it that 等.