Sally has been swimming ______ four hours.   
A．for aboutB．sinceC．a(chǎn)boutD．/
A
本題的含義是她游泳已經(jīng)游了四個(gè)小時(shí)，表示做事時(shí)間長(zhǎng)度，用于完成時(shí)，通常用介詞for連接時(shí)間長(zhǎng)度，故選A.
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