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I’m glad you’ve made great progress so far. Keep it up______ you must be successful.
A．a(chǎn)ndB．whileC．soD．or
A 

試題分析：句意：我很高興你取得了這么大的進(jìn)步。繼續(xù)保持你就會成功。這里使用了固定句型：祈使句+and/or+簡單句，因為是順承關(guān)系，所以用and，選A。
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