The world is changing fast.I strongly believe that one will easily fall behind _______ he keeps on learning.?
A．unlessB．if?
C．whenD．a(chǎn)s
A?
本題考查連詞用法。根據(jù)句意，如果不學(xué)習(xí)很容易落下；所以選A項(xiàng)。
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