This book _______ Lucy’s . Look! Her name is on the book cover(封面).
#77222
A
must be
B
may be
C
can’t be
D
mustn’t be
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We ______ the difficulty together, but why didn't you tell me?
#63504
A
should face
B
might face
C
could have faced
D
must have faced
--- My son is _____ to be seen. Where has he gone? --- I think he _____ in the building. 
#62906
A
nowhere; must be hiding
B
nowhere; must be hidden himself
C
anywhere; hides
D
everywhere; hides himself