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—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

—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

  —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

—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

—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