Lisa, now stop for a short break. You should know that you      all the morning.
A．a(chǎn)re workingB．had been workingC．have been workingD．have worked
C
考查動(dòng)詞時(shí)態(tài)。根據(jù)now stop for a short break，可知現(xiàn)在還在工作，再根據(jù)all the morning，可知整個(gè)早晨一直在工作，所以要用現(xiàn)在完成進(jìn)行時(shí)態(tài)，表示從過去開始到現(xiàn)在一直在進(jìn)行的動(dòng)作。有可能還會(huì)進(jìn)行下去。所以選C。
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