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【单选题】【2010河北省卷】27. Sally is very happy. There is a big smile ________ her face.
A.
on
B.
to
C.
in
D.
at
【单选题】【2010河北省卷】31. —Do we have to finish our homework this afternoon?—Yes, you ________.
A.
must
B.
can
C.
may
D.
need
【单选题】【河北省2011】36. You ____eat the soup if you don't like it.
A.
shouldn't
B.
mustn't
C.
needn't
D.
can't