While we boys were working hard in the garden, our sisters ____ themselves in the house.(2001)
A. had enjoyed
B. enjoy
C. were enjoying
D. would enjoy
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---- ____ George this morning? ---- Not yet, but he is sure to be here before noon. (2001)
A. Will you see
B. Did you see
C. Do you see
D. Have you seen
We ____ a walk when it started to rain. (2000)
A. take
B. took
C. are taking
D. were taking
你是否已读《考生须知》、《考试方案》和《雨课堂考试系统操作手册》？
A. 全部已读
B. 全部未读
C. 部分已读
在回归分折中，因变量y的预测估计是指（ ）
A. 对于自变量x的一个给定值，求出因变量y的平均值
B. 对于自变量x的一个给定值，求出因变量y的个别值
C. 对于因变量y的一个给定值，求出自变量x的平均值
D. 对于因变量y的一个给定值，求出自变量x的个别值
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