What did they do yesterday?

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—Yes, I studied on Sunday.

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⑴What's the matter? {#blank#}1{#/blank#}          A. Thank you.

⑵Let me help you.{#blank#}2{#/blank#}              B. It is a book.

⑶What is it? {#blank#}3{#/blank#}                       C. My leg hurts.

⑷Is it a tree? {#blank#}4{#/blank#}                       D. No, it's my tail.