问题

My mother is _____ .[ ]
A: work
B: on work
C: at work
D:in work
B: on work
C: at work
D:in work
正确答案是:
同类题型
_____ does he do sports every day? He does sports for two hours every day. [ ]
What’s this?—It’s a machine which was invented in __________century in China.
The reason _____ he was driving his car so fast was _____ he would be late.
Whathonest boy! And he isbest student of all.
Could you please_____ the piano so loudly? Your brother is having a rest now.