—Hi, why are you here?
—I ________ for Susan for 15 minutes.
A. have been waiting   
B. have waiting   
C. am waiting
D  am been waiting   
A
本題考查動詞時態(tài)。題意為“—你好，你為什么在這？—我已經(jīng)等蘇珊等了15分鐘了。”“for + 一段時間”和現(xiàn)在完成時連用，排除C選項；現(xiàn)在在完成進行時表示已經(jīng)做了某事，并且一直在做某事，此處表示一直在等，所以現(xiàn)在我完成進行時符合題意。故選A
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