问题补充：
The machine is so old it can’t be used any more some of its parts are changed.
A. as, unless
B. that, unless
C. that ,if
D. whether, or
答案：
A. as, unless
(答案→)B. that, unless
C. that ,if
D. whether, or
解析：so…that…如此…以致是常用句型; unless引导条件状语从句.
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