用should,ought to,have to填空.1.He __ (come)at 4 if the plane arrives on time.2.I didn't go shopping this morning as I ___ (do) the housework.3.She ___ (come) to see me yesterday,but she forgot.4.You __ (ask) for permission before you left the table.5.As they didn't understand,I ___ (explain) everything again.
问题描述：
用should,ought to,have to填空.
1.He __ (come)at 4 if the plane arrives on time.
2.I didn't go shopping this morning as I ___ (do) the housework.3.She ___ (come) to see me yesterday,but she forgot.
4.You __ (ask) for permission before you left the table.
5.As they didn't understand,I ___ (explain) everything again.
答