单项选择题

Colour - blind people often find it difficult to （） between blue and green.

A．separate
B．distinguish
C．compare
D．contrast

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单项选择题
She traveled a great deal （）.

A．so most of her friends did
B．as did most of her friends
C．most of her friends did so
D．most of her friends did it
单项选择题
He said that very clearly so that nobody was in any （） about what was meant.

A．doubt
B．wonder
C．question
D．consideration
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