Maybe you should .A. call on herB. call him atC. call him upD. call up her

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A. call on her
B. call him at
(答案→)C. call him up
D. call up her
解析：call on访问，号召；call at 拜访，停泊； call up打电话给，召集。句意：也许你应该打电话给他。当人称代词做由动词（vt.）+副词构成的短语的宾语时，只能放在副词的前面。故选C。