单项选择题

All ____________ is a continuous supply of fuel oil.

A．the thing needed
B．what is needed
C．that is needed
D．for their need
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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
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
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