问题
选择题
I’m very tired. I _______ on the night shift for several weeks.
A．worked
B．had worked
C．have been working
D．have worked
答案
C
指过去到现在一直进行的动作。由于“上夜班到现在仍未终止”，故应用完成进行时而不用现在完成时。
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I’m very tired. I _______ on the night shift for several weeks.
A．worked
B．had worked
C．have been working
D．have worked
C
指过去到现在一直进行的动作。由于“上夜班到现在仍未终止”，故应用完成进行时而不用现在完成时。