Although Jack made a foolish mistake, we __________ at him
A. ought to have laughed
B. oughtn’t to have laughed
C. ought to laugh
D. should not to laugh
查看答案
动物细胞间的物质交流和信息传递是通过何种连接方式实现的？()
A. 中间连接
B. 间隙连接
C. 桥粒
D. 紧密连接
--- Can you turn down the radio, please？ --- __________ .
A. Oh, I know
B. I’m sorry, I didn’t realize it was that loud
C. I’ll keep it down next time
D. Please forgive me
微信支付 
支付宝支付