“允”字的部首是()
A.ㄥ
B.ㄙ
C.儿
参考答案:C
All the preparations_______, we're ready to start.
A.made
B.being made
C.having made
D.have been made
睡觉时启动空调睡眠功能,空调在人睡着后一段时间自动关机,从而达到节电。