题目内容

When he awoke, he found himself _______ by an old woman.

A. looked after
B. be looked after
C. being looked after
D. to be looked after

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He suddenly felt a(n) ________ pain in the lower part of his back.

A. intense
B. thoughtful
C. original
D. private

It used to be ________ impossible to find Chinese restaurants outside the major cities, but it’s much easier now.

A. eventually
B. physically
C. willingly
D. virtually

关于聚合函数，下列说法正确的是（）

A. 聚合函数一般用于对一组值进行统计，结果返回单个值
B. 聚合函数不能应用于查询子句
C. count不属于聚合函数
D. max与min在一个查询结构中，只能选择一个使用

sum函数计算的对象必须是（）型数据

A. 字符串
B. 数值
C. 日期
D. 任意