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
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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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