单项选择题

The current _________steady and strong, for the boat kept moving forward smoothly.

A．can't have been
B．needn't have been
C．must have been
D．should have been
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单项选择题
The theatres were closed on Saturday and Sunday for routine _________.
A．maintenance
B．supply
C．misfortune
D．support
单项选择题
The farmer ___________ the corn in the yard for the hens.
A．scattered
B．contributed
C．separated
D．assembled
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