The world is changing fast.I strongly believe that one will easily fall behind he keeps o

发布时间：2020-08-17 13:29:17

The world is changing fast.I strongly believe that one will easily fall behind      he keeps on learning.
A. unless
B. if
C. when
D. as

网友回答

(答案→)A. unless
B. if
C. when
D. as
解析：本题考查连词用法。根据句意，如果不学习很容易落下；所以选A项。
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