问题
选择题
Mother was busy washing dishes ________________ Father was watching TV．
A．until
B．if
C．since
D．while
答案
答案：D
题目分析：考查连词。A．until直到；B．if如果；C．since自从；D．while然而，表对比关系。句意：母亲在忙于洗碗，而父亲在看电视。故D正确。
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