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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．proves
C．have been proved
D．are proved
相关考题

He always tells lies though he ______ honest. ...

单项选择题He always tells lies though he ______ honest. ( )

A．feels
B．seems
C．looks
D．appears

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