单项选择题

____________ the news of his father's death, he burst into tears.

A．After hearing
B．On hearing
C．Having heard
D．While hearing
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单项选择题
The first textbooks ____________ for teaching English as a foreign language came out in the 16th can- tury.
A．having written
B．to be written
C．being written
D．written
单项选择题
By no means ____________ look down on the poor.
A．we
B．should we
C．should not we
D．we should
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