单项选择题

This is an old photograph of me when I ______.

A．have short hairs
B．had short hairs
C．have short hair
D．had short hair
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单项选择题
One of the professor's greatest attributes is ______. ( )
A．when he gives lectures
B．how in the manner that he lectures
C．the way to give lectures
D．his ability to lecture
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
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