问题补充：
As a colleague he is great, but as a friend he isfailure.That is why their friendship ended in ruins.
A. /,/
B. /;a
C. a; a
D. a;/
答案：
A. /,/
B. /;a
C. a; a
(答案→)D. a;/
解析：考查冠词。failure作为失败的人或事，是可数名词；in ruins成为废墟，故选D。
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