单项选择题

A．They are having dinner.
B．They are having a class.
C．They are reading.
D．They are filling water.
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单项选择题
He used to stay up very late，but now he has got used to going to bed early．
A) 他习惯于熬夜很晚，但现在已经习惯很早上床睡觉了。
B) 他过去常常熬夜很晚，但现在已经习惯很早上床睡觉了。
C) 他过去习惯熬夜很晚，但现在不得不很早上床睡觉。
D) 他过去熬夜很晚，但现在已经习惯很早就上床睡觉了。
单项选择题
Many a professor looking forward to visiting Korea at present.
A) is
B) are
C) was
D) were
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