题型：单选题题类：真题难易度：容易

—Tina， I have cleaned most of the windows.—That's very kind 　___ you. It's difficult 　　me to do it all by myself.

A、of； for B、for； of C、for； for D、of； of

举一反三

— Look! It's your book, so you can't see it easily.

—Because he was on duty.

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