★ Present Perfect Continuous
I _______________ been ____________ the doorbell for ten minutes. I wonder if anyone is at home.
A. have…ringing
B. has…ringing
C. have…rung
D. has…rung
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The garbage collectors __________________ been ___________ the garbage in our area at all this week. The stench is terrible.
A. are… collecting
B. will not… collecting
C. has not… collected
D. have not… collecting
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