---Is Lucy her homework?No she .A. do; doesn’tB. does; isn’tC. doing; isD. doing;

问题补充：

---Is Lucy her homework?

--- No , she .

A. do; doesn’t

B. does; isn’t

C. doing; is

D. doing; isn’t

答案：

A. do; doesn’t

B. does; isn’t

C. doing; is

(答案→)D. doing; isn’t

解析：根据Is可知，后面应该用doing结构，表示现在进行时；根据Is可知，回答也应该用is回答。所以本题选D。