Mother was busy washing dishes ________________ Father was watching TV．
A．untilB．ifC．since D．while
D

試題分析：考查連詞。A．until直到；B．if如果；C．since自從；D．while然而，表對比關(guān)系。句意：母親在忙于洗碗，而父親在看電視。故D正確。
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