题型：单选题题类：常考题难易度：普通

— Let me help you carry the box.
— No, thanks. It's big, __________ there is nothing in it.

A、and B、so C、but D、because

举一反三

— I'd love to, _____ I have a lot of work to do.

— I'm reading the book ______you lent me last week.

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