执行标准恢复时，需要恢复多个备份文件，包括（）。
A.完整备份文件
B.差异备份文件
C.事务日志备份文件
D.文件组备份文件
参考答案：A, B, C
He left home without saying a word, and _______ worries many people and is to be found out.
A．where he has gone
B．where did he go
C．which place has he gone
D．where has he gone
（）是由“过度需求”引起的。
A.经济危机
B.经济增长
C.通货膨胀
D.滞胀
