单项选择题

The construction of the railway ______ by the end of the next moth.

A．must have been completed
B．must be completed
C．has been completed
D．must complete
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He told me that nothing but toys ______ sold in this shop.
A．are
B．is
C．were
D．to be
单项选择题
It is known to all ______ discovered the America continent.
A．how
B．who
C．when
D．why
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