单项选择题The school staff（）gathered to hear the president speak。
A.is
B.be
C.are
D.will
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1.单项选择题A large crowd（）expected at the football match。
A.is
B.be
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D.will
2.单项选择题Economics, several courses of which I have taken thus far,（）to be difficult but useful for almost all students。
A.prove
B.havebeenproved
C.proves
D.areproved
3.单项选择题The school staff（）gathered to hear the president speak。
A.is
B.be
C.are
D.will
