单项选择题

When we ______ the museum is not decided.

A．visited
B．visit
C．will visit
D．visiting
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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
Tell me since when he ______ in your school.
A．taught
B．has taught
C．teaches
D．had taught
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