单项选择题

The alarm clock didn't ring this morning. I ______ it last night.

A．did forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind
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单项选择题
The girl appeared ______ with the small world her parents had constructed for her.
A．sensitive
B．satisfactory
C．content
D．curious
单项选择题
Which of the following is the best title for the passage
A．A computer model
B．Studies show ice melted equally in the North and the South during the ice age
C．Most of the ice melted in the Northern hemisphere during the 30,000-year long ice age
D．A survey result
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