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's__________as a bellyacher -----he's always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
单项选择题
It is not so much the language__________the cultural background that makes the book difficult to understand.
A．but
B．nor
C．as
D．like
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