单项选择题

Which of the following is the sign of a storm

A．A sudden and warn wind.
B．Thick and lower clouds.
C．Small and feathery cirrus clouds.
D．Dark and thunder clouds.
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The project to build five new schools in this region _______ by the end of the next year.
A．will have been completed
B．will have completed
C．is being completed
D．has been completed
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Many a teacher in our department _______ abroad.
A．have been
B．has been
C．have go
D．has go
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