问题补充：
-- Whose book is this?
-- It must .
A. be Carla
B. belong to Carla’ s
C. belong to Carla
D. is Carla’ s
答案：
A. be Carla
B. belong to Carla’ s
(答案→)C. belong to Carla
D. is Carla’ s
解析：句意：这是谁的书？肯定是Carla的。Belong to sb.属于某人，也可用名词所有格的形式改成be sb.’s. 句中有情态动词must，所以动词用原形，故选C。
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