问题补充:
--- Whose hair band is this ? it be Kate’s ?
--- I’m not sure . It be hers.
A. May ; must
B. Must ; may
C. Can ; must
D. Can ; may
答案:
A. May ; must
B. Must ; may
C. Can ; must
(答案→)D. Can ; may
解析:句意:这是谁的发带?它会是凯特的吗?—我不确定。它可能是她的。May表推测,可能也许大概;must表示肯定推测,一定是, can表能够。根据句意中“我不确定”可知这个发带可能是凯特的。故选D.