单项选择题

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

A. When
B. After
C. Before
D. Now

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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
单项选择题
When Jane fell off the bike, the other children （）

A. were not able to help laughter
B. could not help but laughing
C. could not help laughing
D. could not help to laugh
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