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

It is no good （） remember grammatical rules; you need to practise what you have learned.

A．trying to
B．to try to
C．try to
D．tried to

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