单项选择题

From time to time we must look up words （）.

A．the meanings of those we do not know
B．whose meanings we are not familiar
C．that we do not know their meanings
D．whose meanings we do not know

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单项选择题
She （） be in the classroom. I saw her going to the cinema just two minutes ago.

A．mustn't
B．shouldn't
C．can't
D．needn't
单项选择题
The retired president was very angry （） even by the cooks.

A．to be ignored
B．to have been ignored
C．to having been ignored
D．to have ignored
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