单项选择题

So little ______ about mathematics that the lecture was completely beyond me.

A．I knew
B．do I know
C．did I know
D．have I known

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单项选择题

Have you got some red eggs No, but I've got ______ .

A．any white ones
B．some white ones
C．some white one
D．any white one

单项选择题

You must accustom yourself to be more at your ______ when you are with people.

A．comfort
B．freedom
C．ease
D．peace

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