问题
选择题
______ 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
答案
A
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______ 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
A