the students found the soldier’s idea interesting, the system was too difficult to be of practical use.
A. While
B. Unless
C. As soon as
D. Even if
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(答案→)A. While
B. Unless
C. As soon as
D. Even if
解析：考查状语从句的连词。A尽管；B除非，如果不；C一…就；D即使；句意：尽管学生们认为士兵的想法很有趣，但是这个系统还是太难了而不实用。