单项选择题

They hardly believed that the troop ______ the river that night, and surrounded their city.

A．to cross
B．had crossed
C．crossing
D．cross
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单项选择题
Colorblind people find it difficult to ______ shades of colors.
A．distinguish
B．pick
C．identify
D．recognize
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I'd rather you ______ anything about it for the time being.
A．do
B．didn't do
C．won't do
D．hadn't done
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