单项选择题

Do you know the boy（） under the big tree?

A.lay
B.lain
C.laying
D.Lying

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Most of the artists （） to the party were from South Africa.

A.had been invited
B.to invite
C.being invited
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The computer center,（）last year, is very popular among the students. in the school.

A.opening
B.opened
C.open
D.having opened