单项选择题

I don't doubt ______ the stock market will recover from the economic crisis.

A．if
B．what
C．that
D．which
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单项选择题
Young ______ he is, he has proved to be an able salesman.
A．that
B．who
C．as
D．which
单项选择题
The first textbook ______ for teaching English as a foreign language came out in the 16th century.
A．writing
B．written
C．to write
D．to be written
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