单项选择题
A.student's
B.professor's
C.assistant's
D.librarian's
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单项选择题
A.orB.andC.toD.but
A.or
B.and
C.to
D.but
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单项选择题
Where this plan _________ is on the small amount of time it allows for possible delays.
A.falls off
B.falls behind
C.falls back
D.falls down
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