39．( )My brother came back home while I my homework. A．did B．am doing C．do ——青夏教育精英家教网—

摘要：39．( )My brother came back home while I my homework. A．did B．am doing C．do D．was doing

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My brother came back home while I homework.

A．am doing	B．did
C．was doing	D．were doing

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