单项选择题

All our preparations went _________because the exams were called off.

A．at nothing
B．beyond nothing
C．for nothing
D．into nothing
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单项选择题
He _________the manuscript of his book before sending it to the publisher.
A．revised
B．responded
C．repealed
D．reserved
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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