问题
选择题
The world is changing fast.I strongly believe that one will easily fall behind____he keeps on leaming. [ ]
A. unless
B. if
C. when
D. as
答案
答案：A
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The world is changing fast.I strongly believe that one will easily fall behind____he keeps on leaming. [ ]
A. unless
B. if
C. when
D. as
答案：A