单项选择题

Sally's score on the exam is the lowest in the class. She ______ hard.

A．should have studied
B．must have to study
C．must have studied
D．needn't have studied
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The boy is so lovely. I cannot help ______ his cheek whenever I meet him.
A．kiss
B．to kiss
C．kissing
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单项选择题
In his poems, he compared his little daughter ______ a flower.
A．by
B．to
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