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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单项选择题
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
单项选择题
He meant ______ his homework before lunch, but his pen didn't work.
A．finishing
B．having finished
C．finished
D．to finish
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