【单选题】They ______ so tired if they ______ for a whole day.
A．wouldn't feel ... didn't walk
B．wouldn't feel ... weren't walking
C．wouldn't be feeling ... weren't walking
D．wouldn't be feeling ... hadn't been walking
【单选题】They ______ so tired if they ______ for a whole day.
A．wouldn't feel ... didn't walk
B．wouldn't feel ... weren't walking
C．wouldn't be feeling ... weren't walking
D．wouldn't be feeling ... hadn't been walking
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