单项选择题

Those naughty boys were caught ______ in the river again.

A．to fish
B．fished
C．fishing
D．having fished

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热门试题

填空题

How many people are almost blind to all colorsThere are ___________________________ people who are blind to all colors.

填空题

Why is it dangerous for a color-blind person to pass the traffic lightsBecause they don’t know they can not ________________________the real colors.