单项选择题

Professor Johnson is said ______ some significant advance in his research in the past year.

A．having made
B．making
C．to have made
D．to make
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单项选择题
He ______ unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should act
D．would act
单项选择题
Reading ______ the mind only with materials of knowledge; it is thinking that makes what we read ours.
A．rectifies
B．prolongs
C．minimizes
D．furnishes
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