单项选择题
The police warned people to be ______ against burglary during the festival.
A．in guard
B．on guard
C．under guard
D．like guard
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单项选择题
Maggie was so angry that she felt like ______ some thing at her husband.
A．throwing
B．to throw
C．to have thrown
D．having thrown
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单项选择题
He liked the painting very much, which cost him $1,000. However, he would gladly have paid ______ for it.
A．as much twice
B．much as twice
C．twice as much
D．as twice much
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