---Is Lucy ______ her homework?
--- No , she ________ .
A．do; doesn’tB．does; isn’tC．doing; isD．doing; isn’t
D

試題分析：根據(jù)Is可知，后面應(yīng)該用doing結(jié)構(gòu)，表示現(xiàn)在進(jìn)行時；根據(jù)Is可知，回答也應(yīng)該用is回答。所以本題選D。
點評：做本題時應(yīng)注意be動詞后面的動詞的形式，是不能填原形的；回答be動詞時，應(yīng)該也用be動詞，而回答助動詞時，應(yīng)該用助動詞。
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