— Do you know whose magazine is it?— I think it be Lily’s, for we can find her name on the

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A. can
B. might
C. could
(答案→)D. must
解析：can能,可能;might可能,也许;could,can的过去式,能够;must必须,一定.句意:你知道这是谁的杂志吗?——我认为它肯定是丽丽的，因为我们能在封面上看到她的名字。结合语境可知选D。