问题
The light is still on. He _____ to turn itoff when he _____ the room.
A:Hosting the Olympicssurely would bring about much gain to a city
B:must have forgotten : left
C:may forget : have left
D:could have forgotten : left
B:must have forgotten : left
C:may forget : have left
D:could have forgotten : left
正确答案是：
同类题型
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The fish delicious. Mom, can I have some—Yes, of course. But you should wash your hands first.