单项选择题

Those mosquito bites will itch even more if you ______ them.

A．rub
B．scratch
C．scrub
D．brush
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单项选择题
As he was blamed for damage he hadn't caused, indignation ______ up in him.
A．appeared
B．surged
C．rose
D．soared
单项选择题
In manufacturing, cheaper materials are constantly being ______ for the better and more expensive kind.
A．replaced
B．transformed
C．displaced
D．substituted
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