单选题 When she heard that her mother was safe she immediately _______

【正确答案】 C
【答案解析】本题测试动词短语语义辨异。hurry up：快点；keep up：保持；cheer up：快乐起来；hold up：阻止，妨碍。本句大意：听说母亲很安全，她立刻欢呼起来。