Itisnotenoughonlytherulesofgra

It is not enough only_______the rules of grammar if you want to learn English well.

A．keeping in the mind	B．to keep in mind
C．to keep in your mind	D．keeping in your mind

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A．amazed; confused	B．amazing; confusing
C．amazed; confusing	D．amazing; confused

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A．which

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—Yes, I _______ around the city for almost three hours.

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A．as twice high as	B．twice as high as
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