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23、The troops ____ on for three days and nights．The soldiers are in great need of rest．

A．had marched                  B．have been marching

C．marched                                      D．a(chǎn)re marching

23、B

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The troops ____ on for three days and nights．The soldiers are in great need of rest．

A．had marched                  B．have been marching

C．marched                                      D．a(chǎn)re marching

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