—Where is Mother?—She is in the kitchen. She ______the housework all morning.
#99274
A
does
B
has been doing
C
has done
D
was doing
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(2013·高考重庆卷)I felt very tired when I got home,and I________straight  to bed.
#99707
A
go          
B
went
C
had gone
D
have gone
Three fourths of the homework _______ today.
#103523
A
has finished
B
has been finished
C
have finished
D
have been finished