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I'm mad ________ Marcia.

[　　]

A person with good manners never laughs      people when they are in trouble.

A．on        B．at         C．of         D．to

I knew the answers ________ those questions.

[　　]

A．to

B．of

C．with

D．at

Hundreds of students came to Shaoxing to work _______ the World Choir Games in 2010,

A．at

B．with

C．for

D．on