单项选择题

The teacher should explain the lesson, ______

A．shouldn't he
B．should he
C．doesn't he
D．does he
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单项选择题
Sometimes it is difficult （） the skills you have.

A．to play
B．abilities
C．to recognize
D．recognizes
填空题
Ken: David! （） What have you been up to lately David: No good, I can assure you. And you
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