Although the peak travel time for Chinese railway doesn't start until Jan 19 this year, people who're eager to get a seat on the train _______ already _______ their struggles.
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A
are; starting
B
has; started
C
have; started
D
are; started
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(2013·高考重庆卷)I felt very tired when I got home,and I________straight  to bed.
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A
go          
B
went
C
had gone
D
have gone
Three fourths of the homework _______ today.
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A
has finished
B
has been finished
C
have finished
D
have been finished