问题
选择题
I'd really appreciate ________ if you would turn off the lights before you leave.[ ]
A．you
B．that
C．as
D．it
答案
答案：D
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I'd really appreciate ________ if you would turn off the lights before you leave.[ ]
A．you
B．that
C．as
D．it
答案：D
a+、AlO2-、SO42-