单项选择题

The first textbooks for teaching English as a foreign language came out in the 16th century.

A．having written
B．to be written
C．being written
D．written
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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
单项选择题
He hopes he can visit the United Nations building while he ______ in New York next summer.
A．has been
B．is
C．will be
D．shall be
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