—What should I wear for the party?—It’s an informal one; it doesn’t matter you’re dressed

问题补充：

—What should I wear for the party?

—It’s an informal one; it doesn’t matter you’re dressed.

A. what

B. when

C. how

D. whether

答案：

A. what

B. when

(答案→)C. how

D. whether

解析：不是正式的晚会，怎么穿都没关系。因此用 how。