单项选择题

By the end of last term, we ______ ten units.

A．learned
B．has learned
C．had learned
D．learns
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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
单项选择题
He told me that nothing but toys ______ sold in this shop.
A．are
B．is
C．were
D．to be
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