He is sweating heavily. He _______ weightlifting for a long time.
A．could have practicedB．can practiceC．must have practiced D．might practice
C

試題分析：考查情態(tài)動(dòng)詞。根據(jù)第一句內(nèi)容可知，這是對(duì)過(guò)去的肯定推測(cè)。句意：他流了很多汗。他肯定已經(jīng)練習(xí)舉重很長(zhǎng)時(shí)間了。故C正確。
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