单项选择题

Mr. Brown doesn't think that all bad languages should be allowed. In his opinion, there are ______ that should be kept up.

A．degrees
B．standards
C．levels
D．limits
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单项选择题
She hurriedly left the room as if ______.
A．she angry
B．was angry
C．it was angry
D．angry
单项选择题
It is ______ his advice on how ______ English well ______ you a lot of trouble.
A．because; to learn; that will avoid
B．taking; to learn; that will save
C．because of; learn; which will waste
D．for; to learn; that will make
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