单项选择题

I haven’t seen my neighbors for over a week. They _________ on a trip abroad.

A．may go
B．may have gone
C．must go
D．ought to go
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单项选择题
Can you _________ your absence from the class last Thursday
A．explain
B．examine
C．excuse
D．expand
单项选择题
— Can you help me—_________.
A．No, I don't know.
B．Don't mention it.
C．Sure, What is it
D．That's it.
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