单项选择题

It is sometimes difficult ______ you have just met.

A．to make pleasant conversation among people
B．making pleasant conversation to people
C．making pleasant conversation for people
D．to make pleasant conversation with people

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单项选择题

______, I'd have told you.

A．If I would have known it
B．If I had have known it
C．Had I known it
D．Should I know it