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Put the verbs in brackets into the present perfect o present perfect continuous.
1.A:Your Clothes are dirty.What ...(you/do)
B:I...(work) in the garden all morning.

2.A: Sorry, I'm late....(you/wait) long?
B:I...(just arrive)

3.A:How long ...(Mary/teach) in your school?
B:She ...(be) here for three years now. ​