学校里最重要的缺失需求是（）。
A.安全和生理
B.安全和尊重
C.爱和尊重
D.自我实现
参考答案：C
The ground is all wet. It _________ last night.
A．can’t have rained
B．may have rained
C．can have rained
D．must have rained
