E-R图中实体用什么形状_,联系用什么形状_,属性用什么形状_。
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A rescue worker risked his life saving two tourists who＿＿in the mountains for two days.
A. are trapping
B. have trapped
C. were trapping
D. had been trapped
—Good morning, Mr. lee’s office.—Good morning. I’d like to make an appointment＿＿next Wednesday afternoon.
A. for
B. on
C. in
D. at
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