单项选择题

When a fire（）at the National Exhibition in London, at least ten priceless paintings were completely destroyed.

A. broke off
B. broke out
C. broke down
D. broke up

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（）that your son is well again, you no longer have anything to worry about.

A. When
B. After
C. Before
D. Now
单项选择题
I don't believe him. He（）be serious.

A. needn't
B. can't
C. may not
D. mustn't
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