–I missed the first part of film Avatar.–- What a pity ! You should be here half hour ea

问题补充：

–I missed the first part of film Avatar.

–- What a pity ! You should be here half hour earlier.

A. a, the

B. a, an

C. the, a

D. the, an

答案：

A. a, the

B. a, an

C. the, a

(答案→)D. the, an

解析：本题考查冠词句中the film特指电影，half an hour半个小时。句意：——我错过了电影《阿凡达》第一部分。——真可惜！你应当早半个小时到这儿。