题目

  —Who has taken my pen away?    —__________. He was here a moment ago. A. It must be Li Ping           B. It is Li Ping take C. Li Ping is                  D. Li Ping must take 答案：A 解析: 本题是对情态动词的考查。句意表示肯定的推测用must，而it指问句中提到的who。  

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