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5. (2015ºÓÄÏʦ´ó¸½ÖÐÄ£ÄâÊÔÌâ) Ò»Look!The man at the gate be our teacher. He is always standing there every morning.
¡ªNo,it be him. He is having a meeting in the office now.
A. must; can¡¯t B. must; mustn¡¯t
C. can¡¯t; can¡¯t D.can couldn¡¯t
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