I’m very tired. I _______ on the night shift for several weeks.?
A．workedB．had worked
C．have been workingD．have worked?
C?
指過去到現(xiàn)在一直進(jìn)行的動作。由于“上夜班到現(xiàn)在仍未終止”，故應(yīng)用完成進(jìn)行時而不用現(xiàn)在完成時。
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