单项选择题

I wonder who drank all the milk yesterday. It ______ have been Peter because he was out all day.

A．mustn't
B．can't
C．won't
D．needn't
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单项选择题
The poem is difficult to understand because it contains so many ______ references.
A．obscure
B．acute
C．notable
D．objective
单项选择题
Label on a bottle of medicine: It is dangerous to exceed the stated ______ .
A．drops
B．measure
C．dose
D．limit
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