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．a(chǎn)s

17、A

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科目：高中英語 來源： 題型：

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．a(chǎn)s

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科目：高中英語 來源： 題型：

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．a(chǎn)s

 

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