—What a great cook your sister is! —Yeah! We never have enough of her cookiesA. may B.

问题补充：

—What a great cook your sister is!

—Yeah! We never have enough of her cookies．

A. may

B. must

C. should

D. can

答案：

A. may

B. must

C. should

(答案→)D. can

解析：考查情态动词：A．may可以，B．must必须，C．should应该，D．can可能，这里考查的是can not…enough再…怎么也不为过，句意是：你姐姐的厨艺真好。--是，她的饼干我们再怎么吃也不够。选D。