单项选择题

A．Because they all work very hard.
B．Because their teachers are all native speakers of English.
C．Because they learn not only in but also out of class.
D．Because they are all advanced students.
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单项选择题
A week after he had written to his brother, Jackson began______.
A．telephoning the bank
B．visiting the bank
C．shouting at the clerks of the bank
D．explaining his problem to the clerks of the bank
填空题
natural
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