Don’t turn off the computer before closing all programs, _________ you could have problems.
A．orB．a(chǎn)ndC．butD．so
A

試題分析：句意：所有的程序關(guān)閉之前不要關(guān)上電腦，否則，你可能有問(wèn)題。or 或者，否則； and 而且；   but 但是；so 所以。根據(jù)空格后you could have problems，可知如果不按照前面的去做，就會(huì)有問(wèn)題。故選A。
考點(diǎn)：
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