单项选择题

Millions of tons of water are （） by a complex system of dykes.

A．held up
B．held on
C．held out
D．held back

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单项选择题

The manager didn't have time to go into his plan （）, but he gave us an idea about it.

A．in turn
B．in conclusion
C．at first
D．at length

单项选择题

How did it come （） that you made a lot of mistakes in your homework.

A．about
B．along
C．around
D．by

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