问题
选择题
— Someone is knocking at the door. Who _____ it be?
— It must be the milkman. [ ]
A. may
B. must
C. can
D. need
答案
答案：C
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— Someone is knocking at the door. Who _____ it be?
— It must be the milkman. [ ]
A. may
B. must
C. can
D. need
答案：C