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an ;a a ; an an ; 不填 a ; 不填
takes, to do take, to do takes, do take , do
an; a a; the an ; / a ; /
Another hour An hour later After an hour In an hour
spends; walking takes; to walk spends; to walk takes; walking
half an hour a hour two hour half a hour
half an hour a hour
two hour half a hour
costs; spends spends; take takes; costs spends; takes
m. There is one hour left. A. takes off takes away takes care takes place
two and a half hour two and a half hours two hour and a half two hour and half an hour
takes, to do takes, doing took, to do took, doing
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