单项选择题

Tell me since when he ______ in your school.

A．taught
B．has taught
C．teaches
D．had taught
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单项选择题
Welcome to my birthday party, but you needn't ______ any present.
A．bring
B．bringing
C．brought
D．have brought
单项选择题
Some warm-blooded animals ______ hibernate.
A．need not
B．does not need
C．not need
D．do not need
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