问题
选择题
The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.
A．which
B．that
C．across which
D．through which
答案
答案：D
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The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.
A．which
B．that
C．across which
D．through which
答案：D