—Who has taken my pen away?
—__________. He was here a moment ago.  
A．It must be Li PingB．It is Li Ping take
C．Li Ping isD．Li Ping must take
A
本題是對情態(tài)動詞的考查。句意表示肯定的推測用must，而it指問句中提到的who。  
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