have done是什么时态

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• 1.-Why are you in a hurry?-( )my mother is ill,I have to take her to hospital.A.For B.Since C.As D.Because2.-Hello,you look tired today.-Yes ,Ispent too late yesterdayevening.I( )my homework and forgot the time .A.was doing B.has done C.have done希望能给讲解一下.
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